1 /*
2 * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "classfile/javaClasses.inline.hpp"
27 #include "classfile/stringTable.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "classfile/vmSymbols.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/compiledIC.hpp"
32 #include "code/nmethod.inline.hpp"
33 #include "code/scopeDesc.hpp"
34 #include "code/vtableStubs.hpp"
35 #include "compiler/abstractCompiler.hpp"
36 #include "compiler/compileBroker.hpp"
37 #include "compiler/disassembler.hpp"
38 #include "gc/shared/barrierSet.hpp"
39 #include "gc/shared/collectedHeap.hpp"
40 #include "gc/shared/gcLocker.inline.hpp"
41 #include "interpreter/interpreter.hpp"
42 #include "interpreter/interpreterRuntime.hpp"
43 #include "jvm.h"
44 #include "jfr/jfrEvents.hpp"
45 #include "logging/log.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "memory/universe.hpp"
48 #include "metaprogramming/primitiveConversions.hpp"
49 #include "oops/klass.hpp"
50 #include "oops/method.inline.hpp"
51 #include "oops/objArrayKlass.hpp"
52 #include "oops/oop.inline.hpp"
53 #include "prims/forte.hpp"
54 #include "prims/jvmtiExport.hpp"
55 #include "prims/jvmtiThreadState.hpp"
56 #include "prims/methodHandles.hpp"
57 #include "prims/nativeLookup.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/frame.inline.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/jniHandles.inline.hpp"
66 #include "runtime/sharedRuntime.hpp"
67 #include "runtime/stackWatermarkSet.hpp"
68 #include "runtime/stubRoutines.hpp"
69 #include "runtime/synchronizer.hpp"
70 #include "runtime/vframe.inline.hpp"
71 #include "runtime/vframeArray.hpp"
72 #include "runtime/vm_version.hpp"
73 #include "utilities/copy.hpp"
74 #include "utilities/dtrace.hpp"
75 #include "utilities/events.hpp"
76 #include "utilities/resourceHash.hpp"
77 #include "utilities/macros.hpp"
78 #include "utilities/xmlstream.hpp"
79 #ifdef COMPILER1
80 #include "c1/c1_Runtime1.hpp"
81 #endif
82 #if INCLUDE_JFR
83 #include "jfr/jfr.hpp"
84 #endif
85
86 // Shared stub locations
87 RuntimeStub* SharedRuntime::_wrong_method_blob;
88 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
89 RuntimeStub* SharedRuntime::_ic_miss_blob;
90 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
91 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
92 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
93 address SharedRuntime::_resolve_static_call_entry;
94
95 DeoptimizationBlob* SharedRuntime::_deopt_blob;
96 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
97 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
98 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
99
100 #ifdef COMPILER2
101 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
102 #endif // COMPILER2
103
104 nmethod* SharedRuntime::_cont_doYield_stub;
105
106 //----------------------------generate_stubs-----------------------------------
107 void SharedRuntime::generate_stubs() {
108 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
109 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
110 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
111 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
112 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
113 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
114 _resolve_static_call_entry = _resolve_static_call_blob->entry_point();
115
116 AdapterHandlerLibrary::initialize();
117
118 #if COMPILER2_OR_JVMCI
119 // Vectors are generated only by C2 and JVMCI.
120 bool support_wide = is_wide_vector(MaxVectorSize);
121 if (support_wide) {
122 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
123 }
124 #endif // COMPILER2_OR_JVMCI
125 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
126 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
127
128 generate_deopt_blob();
129
130 #ifdef COMPILER2
131 generate_uncommon_trap_blob();
132 #endif // COMPILER2
133 }
134
135 #include <math.h>
136
137 // Implementation of SharedRuntime
138
139 #ifndef PRODUCT
140 // For statistics
141 uint SharedRuntime::_ic_miss_ctr = 0;
142 uint SharedRuntime::_wrong_method_ctr = 0;
143 uint SharedRuntime::_resolve_static_ctr = 0;
144 uint SharedRuntime::_resolve_virtual_ctr = 0;
145 uint SharedRuntime::_resolve_opt_virtual_ctr = 0;
146 uint SharedRuntime::_implicit_null_throws = 0;
147 uint SharedRuntime::_implicit_div0_throws = 0;
148
149 int64_t SharedRuntime::_nof_normal_calls = 0;
150 int64_t SharedRuntime::_nof_inlined_calls = 0;
151 int64_t SharedRuntime::_nof_megamorphic_calls = 0;
152 int64_t SharedRuntime::_nof_static_calls = 0;
153 int64_t SharedRuntime::_nof_inlined_static_calls = 0;
154 int64_t SharedRuntime::_nof_interface_calls = 0;
155 int64_t SharedRuntime::_nof_inlined_interface_calls = 0;
156
157 uint SharedRuntime::_new_instance_ctr=0;
158 uint SharedRuntime::_new_array_ctr=0;
159 uint SharedRuntime::_multi2_ctr=0;
160 uint SharedRuntime::_multi3_ctr=0;
161 uint SharedRuntime::_multi4_ctr=0;
162 uint SharedRuntime::_multi5_ctr=0;
163 uint SharedRuntime::_mon_enter_stub_ctr=0;
164 uint SharedRuntime::_mon_exit_stub_ctr=0;
165 uint SharedRuntime::_mon_enter_ctr=0;
166 uint SharedRuntime::_mon_exit_ctr=0;
167 uint SharedRuntime::_partial_subtype_ctr=0;
168 uint SharedRuntime::_jbyte_array_copy_ctr=0;
169 uint SharedRuntime::_jshort_array_copy_ctr=0;
170 uint SharedRuntime::_jint_array_copy_ctr=0;
171 uint SharedRuntime::_jlong_array_copy_ctr=0;
172 uint SharedRuntime::_oop_array_copy_ctr=0;
173 uint SharedRuntime::_checkcast_array_copy_ctr=0;
174 uint SharedRuntime::_unsafe_array_copy_ctr=0;
175 uint SharedRuntime::_generic_array_copy_ctr=0;
176 uint SharedRuntime::_slow_array_copy_ctr=0;
177 uint SharedRuntime::_find_handler_ctr=0;
178 uint SharedRuntime::_rethrow_ctr=0;
179 uint SharedRuntime::_unsafe_set_memory_ctr=0;
180
181 int SharedRuntime::_ICmiss_index = 0;
182 int SharedRuntime::_ICmiss_count[SharedRuntime::maxICmiss_count];
183 address SharedRuntime::_ICmiss_at[SharedRuntime::maxICmiss_count];
184
185
186 void SharedRuntime::trace_ic_miss(address at) {
187 for (int i = 0; i < _ICmiss_index; i++) {
188 if (_ICmiss_at[i] == at) {
189 _ICmiss_count[i]++;
190 return;
191 }
192 }
193 int index = _ICmiss_index++;
194 if (_ICmiss_index >= maxICmiss_count) _ICmiss_index = maxICmiss_count - 1;
195 _ICmiss_at[index] = at;
196 _ICmiss_count[index] = 1;
197 }
198
199 void SharedRuntime::print_ic_miss_histogram() {
200 if (ICMissHistogram) {
201 tty->print_cr("IC Miss Histogram:");
202 int tot_misses = 0;
203 for (int i = 0; i < _ICmiss_index; i++) {
204 tty->print_cr(" at: " INTPTR_FORMAT " nof: %d", p2i(_ICmiss_at[i]), _ICmiss_count[i]);
205 tot_misses += _ICmiss_count[i];
206 }
207 tty->print_cr("Total IC misses: %7d", tot_misses);
208 }
209 }
210 #endif // PRODUCT
211
212
213 JRT_LEAF(jlong, SharedRuntime::lmul(jlong y, jlong x))
214 return x * y;
215 JRT_END
216
217
218 JRT_LEAF(jlong, SharedRuntime::ldiv(jlong y, jlong x))
219 if (x == min_jlong && y == CONST64(-1)) {
220 return x;
221 } else {
222 return x / y;
223 }
224 JRT_END
225
226
227 JRT_LEAF(jlong, SharedRuntime::lrem(jlong y, jlong x))
228 if (x == min_jlong && y == CONST64(-1)) {
229 return 0;
230 } else {
231 return x % y;
232 }
233 JRT_END
234
235
236 #ifdef _WIN64
237 const juint float_sign_mask = 0x7FFFFFFF;
238 const juint float_infinity = 0x7F800000;
239 const julong double_sign_mask = CONST64(0x7FFFFFFFFFFFFFFF);
240 const julong double_infinity = CONST64(0x7FF0000000000000);
241 #endif
242
243 #if !defined(X86)
244 JRT_LEAF(jfloat, SharedRuntime::frem(jfloat x, jfloat y))
245 #ifdef _WIN64
246 // 64-bit Windows on amd64 returns the wrong values for
247 // infinity operands.
248 juint xbits = PrimitiveConversions::cast<juint>(x);
249 juint ybits = PrimitiveConversions::cast<juint>(y);
250 // x Mod Infinity == x unless x is infinity
251 if (((xbits & float_sign_mask) != float_infinity) &&
252 ((ybits & float_sign_mask) == float_infinity) ) {
253 return x;
254 }
255 return ((jfloat)fmod_winx64((double)x, (double)y));
256 #else
257 return ((jfloat)fmod((double)x,(double)y));
258 #endif
259 JRT_END
260
261 JRT_LEAF(jdouble, SharedRuntime::drem(jdouble x, jdouble y))
262 #ifdef _WIN64
263 julong xbits = PrimitiveConversions::cast<julong>(x);
264 julong ybits = PrimitiveConversions::cast<julong>(y);
265 // x Mod Infinity == x unless x is infinity
266 if (((xbits & double_sign_mask) != double_infinity) &&
267 ((ybits & double_sign_mask) == double_infinity) ) {
268 return x;
269 }
270 return ((jdouble)fmod_winx64((double)x, (double)y));
271 #else
272 return ((jdouble)fmod((double)x,(double)y));
273 #endif
274 JRT_END
275 #endif // !X86
276
277 JRT_LEAF(jfloat, SharedRuntime::i2f(jint x))
278 return (jfloat)x;
279 JRT_END
280
281 #ifdef __SOFTFP__
282 JRT_LEAF(jfloat, SharedRuntime::fadd(jfloat x, jfloat y))
283 return x + y;
284 JRT_END
285
286 JRT_LEAF(jfloat, SharedRuntime::fsub(jfloat x, jfloat y))
287 return x - y;
288 JRT_END
289
290 JRT_LEAF(jfloat, SharedRuntime::fmul(jfloat x, jfloat y))
291 return x * y;
292 JRT_END
293
294 JRT_LEAF(jfloat, SharedRuntime::fdiv(jfloat x, jfloat y))
295 return x / y;
296 JRT_END
297
298 JRT_LEAF(jdouble, SharedRuntime::dadd(jdouble x, jdouble y))
299 return x + y;
300 JRT_END
301
302 JRT_LEAF(jdouble, SharedRuntime::dsub(jdouble x, jdouble y))
303 return x - y;
304 JRT_END
305
306 JRT_LEAF(jdouble, SharedRuntime::dmul(jdouble x, jdouble y))
307 return x * y;
308 JRT_END
309
310 JRT_LEAF(jdouble, SharedRuntime::ddiv(jdouble x, jdouble y))
311 return x / y;
312 JRT_END
313
314 JRT_LEAF(jdouble, SharedRuntime::i2d(jint x))
315 return (jdouble)x;
316 JRT_END
317
318 JRT_LEAF(jdouble, SharedRuntime::f2d(jfloat x))
319 return (jdouble)x;
320 JRT_END
321
322 JRT_LEAF(int, SharedRuntime::fcmpl(float x, float y))
323 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan*/
324 JRT_END
325
326 JRT_LEAF(int, SharedRuntime::fcmpg(float x, float y))
327 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
328 JRT_END
329
330 JRT_LEAF(int, SharedRuntime::dcmpl(double x, double y))
331 return x>y ? 1 : (x==y ? 0 : -1); /* x<y or is_nan */
332 JRT_END
333
334 JRT_LEAF(int, SharedRuntime::dcmpg(double x, double y))
335 return x<y ? -1 : (x==y ? 0 : 1); /* x>y or is_nan */
336 JRT_END
337
338 // Functions to return the opposite of the aeabi functions for nan.
339 JRT_LEAF(int, SharedRuntime::unordered_fcmplt(float x, float y))
340 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
341 JRT_END
342
343 JRT_LEAF(int, SharedRuntime::unordered_dcmplt(double x, double y))
344 return (x < y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
345 JRT_END
346
347 JRT_LEAF(int, SharedRuntime::unordered_fcmple(float x, float y))
348 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
349 JRT_END
350
351 JRT_LEAF(int, SharedRuntime::unordered_dcmple(double x, double y))
352 return (x <= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
353 JRT_END
354
355 JRT_LEAF(int, SharedRuntime::unordered_fcmpge(float x, float y))
356 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
357 JRT_END
358
359 JRT_LEAF(int, SharedRuntime::unordered_dcmpge(double x, double y))
360 return (x >= y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
361 JRT_END
362
363 JRT_LEAF(int, SharedRuntime::unordered_fcmpgt(float x, float y))
364 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
365 JRT_END
366
367 JRT_LEAF(int, SharedRuntime::unordered_dcmpgt(double x, double y))
368 return (x > y) ? 1 : ((g_isnan(x) || g_isnan(y)) ? 1 : 0);
369 JRT_END
370
371 // Intrinsics make gcc generate code for these.
372 float SharedRuntime::fneg(float f) {
373 return -f;
374 }
375
376 double SharedRuntime::dneg(double f) {
377 return -f;
378 }
379
380 #endif // __SOFTFP__
381
382 #if defined(__SOFTFP__) || defined(E500V2)
383 // Intrinsics make gcc generate code for these.
384 double SharedRuntime::dabs(double f) {
385 return (f <= (double)0.0) ? (double)0.0 - f : f;
386 }
387
388 #endif
389
390 #if defined(__SOFTFP__) || defined(PPC)
391 double SharedRuntime::dsqrt(double f) {
392 return sqrt(f);
393 }
394 #endif
395
396 JRT_LEAF(jint, SharedRuntime::f2i(jfloat x))
397 if (g_isnan(x))
398 return 0;
399 if (x >= (jfloat) max_jint)
400 return max_jint;
401 if (x <= (jfloat) min_jint)
402 return min_jint;
403 return (jint) x;
404 JRT_END
405
406
407 JRT_LEAF(jlong, SharedRuntime::f2l(jfloat x))
408 if (g_isnan(x))
409 return 0;
410 if (x >= (jfloat) max_jlong)
411 return max_jlong;
412 if (x <= (jfloat) min_jlong)
413 return min_jlong;
414 return (jlong) x;
415 JRT_END
416
417
418 JRT_LEAF(jint, SharedRuntime::d2i(jdouble x))
419 if (g_isnan(x))
420 return 0;
421 if (x >= (jdouble) max_jint)
422 return max_jint;
423 if (x <= (jdouble) min_jint)
424 return min_jint;
425 return (jint) x;
426 JRT_END
427
428
429 JRT_LEAF(jlong, SharedRuntime::d2l(jdouble x))
430 if (g_isnan(x))
431 return 0;
432 if (x >= (jdouble) max_jlong)
433 return max_jlong;
434 if (x <= (jdouble) min_jlong)
435 return min_jlong;
436 return (jlong) x;
437 JRT_END
438
439
440 JRT_LEAF(jfloat, SharedRuntime::d2f(jdouble x))
441 return (jfloat)x;
442 JRT_END
443
444
445 JRT_LEAF(jfloat, SharedRuntime::l2f(jlong x))
446 return (jfloat)x;
447 JRT_END
448
449
450 JRT_LEAF(jdouble, SharedRuntime::l2d(jlong x))
451 return (jdouble)x;
452 JRT_END
453
454
455 // Exception handling across interpreter/compiler boundaries
456 //
457 // exception_handler_for_return_address(...) returns the continuation address.
458 // The continuation address is the entry point of the exception handler of the
459 // previous frame depending on the return address.
460
461 address SharedRuntime::raw_exception_handler_for_return_address(JavaThread* current, address return_address) {
462 // Note: This is called when we have unwound the frame of the callee that did
463 // throw an exception. So far, no check has been performed by the StackWatermarkSet.
464 // Notably, the stack is not walkable at this point, and hence the check must
465 // be deferred until later. Specifically, any of the handlers returned here in
466 // this function, will get dispatched to, and call deferred checks to
467 // StackWatermarkSet::after_unwind at a point where the stack is walkable.
468 assert(frame::verify_return_pc(return_address), "must be a return address: " INTPTR_FORMAT, p2i(return_address));
469 assert(current->frames_to_pop_failed_realloc() == 0 || Interpreter::contains(return_address), "missed frames to pop?");
470
471 // Reset method handle flag.
472 current->set_is_method_handle_return(false);
473
474 #if INCLUDE_JVMCI
475 // JVMCI's ExceptionHandlerStub expects the thread local exception PC to be clear
476 // and other exception handler continuations do not read it
477 current->set_exception_pc(nullptr);
478 #endif // INCLUDE_JVMCI
479
480 if (Continuation::is_return_barrier_entry(return_address)) {
481 return StubRoutines::cont_returnBarrierExc();
482 }
483
484 // The fastest case first
485 CodeBlob* blob = CodeCache::find_blob(return_address);
486 nmethod* nm = (blob != nullptr) ? blob->as_nmethod_or_null() : nullptr;
487 if (nm != nullptr) {
488 // Set flag if return address is a method handle call site.
489 current->set_is_method_handle_return(nm->is_method_handle_return(return_address));
490 // native nmethods don't have exception handlers
491 assert(!nm->is_native_method() || nm->method()->is_continuation_enter_intrinsic(), "no exception handler");
492 assert(nm->header_begin() != nm->exception_begin(), "no exception handler");
493 if (nm->is_deopt_pc(return_address)) {
494 // If we come here because of a stack overflow, the stack may be
495 // unguarded. Reguard the stack otherwise if we return to the
496 // deopt blob and the stack bang causes a stack overflow we
497 // crash.
498 StackOverflow* overflow_state = current->stack_overflow_state();
499 bool guard_pages_enabled = overflow_state->reguard_stack_if_needed();
500 if (overflow_state->reserved_stack_activation() != current->stack_base()) {
501 overflow_state->set_reserved_stack_activation(current->stack_base());
502 }
503 assert(guard_pages_enabled, "stack banging in deopt blob may cause crash");
504 // The deferred StackWatermarkSet::after_unwind check will be performed in
505 // Deoptimization::fetch_unroll_info (with exec_mode == Unpack_exception)
506 return SharedRuntime::deopt_blob()->unpack_with_exception();
507 } else {
508 // The deferred StackWatermarkSet::after_unwind check will be performed in
509 // * OptoRuntime::handle_exception_C_helper for C2 code
510 // * exception_handler_for_pc_helper via Runtime1::handle_exception_from_callee_id for C1 code
511 return nm->exception_begin();
512 }
513 }
514
515 // Entry code
516 if (StubRoutines::returns_to_call_stub(return_address)) {
517 // The deferred StackWatermarkSet::after_unwind check will be performed in
518 // JavaCallWrapper::~JavaCallWrapper
519 return StubRoutines::catch_exception_entry();
520 }
521 if (blob != nullptr && blob->is_upcall_stub()) {
522 return StubRoutines::upcall_stub_exception_handler();
523 }
524 // Interpreted code
525 if (Interpreter::contains(return_address)) {
526 // The deferred StackWatermarkSet::after_unwind check will be performed in
527 // InterpreterRuntime::exception_handler_for_exception
528 return Interpreter::rethrow_exception_entry();
529 }
530
531 guarantee(blob == nullptr || !blob->is_runtime_stub(), "caller should have skipped stub");
532 guarantee(!VtableStubs::contains(return_address), "null exceptions in vtables should have been handled already!");
533
534 #ifndef PRODUCT
535 { ResourceMark rm;
536 tty->print_cr("No exception handler found for exception at " INTPTR_FORMAT " - potential problems:", p2i(return_address));
537 os::print_location(tty, (intptr_t)return_address);
538 tty->print_cr("a) exception happened in (new?) code stubs/buffers that is not handled here");
539 tty->print_cr("b) other problem");
540 }
541 #endif // PRODUCT
542 ShouldNotReachHere();
543 return nullptr;
544 }
545
546
547 JRT_LEAF(address, SharedRuntime::exception_handler_for_return_address(JavaThread* current, address return_address))
548 return raw_exception_handler_for_return_address(current, return_address);
549 JRT_END
550
551
552 address SharedRuntime::get_poll_stub(address pc) {
553 address stub;
554 // Look up the code blob
555 CodeBlob *cb = CodeCache::find_blob(pc);
556
557 // Should be an nmethod
558 guarantee(cb != nullptr && cb->is_nmethod(), "safepoint polling: pc must refer to an nmethod");
559
560 // Look up the relocation information
561 assert(cb->as_nmethod()->is_at_poll_or_poll_return(pc),
562 "safepoint polling: type must be poll at pc " INTPTR_FORMAT, p2i(pc));
563
564 #ifdef ASSERT
565 if (!((NativeInstruction*)pc)->is_safepoint_poll()) {
566 tty->print_cr("bad pc: " PTR_FORMAT, p2i(pc));
567 Disassembler::decode(cb);
568 fatal("Only polling locations are used for safepoint");
569 }
570 #endif
571
572 bool at_poll_return = cb->as_nmethod()->is_at_poll_return(pc);
573 bool has_wide_vectors = cb->as_nmethod()->has_wide_vectors();
574 if (at_poll_return) {
575 assert(SharedRuntime::polling_page_return_handler_blob() != nullptr,
576 "polling page return stub not created yet");
577 stub = SharedRuntime::polling_page_return_handler_blob()->entry_point();
578 } else if (has_wide_vectors) {
579 assert(SharedRuntime::polling_page_vectors_safepoint_handler_blob() != nullptr,
580 "polling page vectors safepoint stub not created yet");
581 stub = SharedRuntime::polling_page_vectors_safepoint_handler_blob()->entry_point();
582 } else {
583 assert(SharedRuntime::polling_page_safepoint_handler_blob() != nullptr,
584 "polling page safepoint stub not created yet");
585 stub = SharedRuntime::polling_page_safepoint_handler_blob()->entry_point();
586 }
587 log_debug(safepoint)("... found polling page %s exception at pc = "
588 INTPTR_FORMAT ", stub =" INTPTR_FORMAT,
589 at_poll_return ? "return" : "loop",
590 (intptr_t)pc, (intptr_t)stub);
591 return stub;
592 }
593
594 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Handle h_exception) {
595 if (JvmtiExport::can_post_on_exceptions()) {
596 vframeStream vfst(current, true);
597 methodHandle method = methodHandle(current, vfst.method());
598 address bcp = method()->bcp_from(vfst.bci());
599 JvmtiExport::post_exception_throw(current, method(), bcp, h_exception());
600 }
601
602 #if INCLUDE_JVMCI
603 if (EnableJVMCI && UseJVMCICompiler) {
604 vframeStream vfst(current, true);
605 methodHandle method = methodHandle(current, vfst.method());
606 int bci = vfst.bci();
607 MethodData* trap_mdo = method->method_data();
608 if (trap_mdo != nullptr) {
609 // Set exception_seen if the exceptional bytecode is an invoke
610 Bytecode_invoke call = Bytecode_invoke_check(method, bci);
611 if (call.is_valid()) {
612 ResourceMark rm(current);
613
614 // Lock to read ProfileData, and ensure lock is not broken by a safepoint
615 MutexLocker ml(trap_mdo->extra_data_lock(), Mutex::_no_safepoint_check_flag);
616
617 ProfileData* pdata = trap_mdo->allocate_bci_to_data(bci, nullptr);
618 if (pdata != nullptr && pdata->is_BitData()) {
619 BitData* bit_data = (BitData*) pdata;
620 bit_data->set_exception_seen();
621 }
622 }
623 }
624 }
625 #endif
626
627 Exceptions::_throw(current, __FILE__, __LINE__, h_exception);
628 }
629
630 void SharedRuntime::throw_and_post_jvmti_exception(JavaThread* current, Symbol* name, const char *message) {
631 Handle h_exception = Exceptions::new_exception(current, name, message);
632 throw_and_post_jvmti_exception(current, h_exception);
633 }
634
635 #if INCLUDE_JVMTI
636 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_start(oopDesc* vt, jboolean hide, JavaThread* current))
637 assert(hide == JNI_FALSE, "must be VTMS transition finish");
638 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
639 JvmtiVTMSTransitionDisabler::VTMS_vthread_start(vthread);
640 JNIHandles::destroy_local(vthread);
641 JRT_END
642
643 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_end(oopDesc* vt, jboolean hide, JavaThread* current))
644 assert(hide == JNI_TRUE, "must be VTMS transition start");
645 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
646 JvmtiVTMSTransitionDisabler::VTMS_vthread_end(vthread);
647 JNIHandles::destroy_local(vthread);
648 JRT_END
649
650 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_mount(oopDesc* vt, jboolean hide, JavaThread* current))
651 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
652 JvmtiVTMSTransitionDisabler::VTMS_vthread_mount(vthread, hide);
653 JNIHandles::destroy_local(vthread);
654 JRT_END
655
656 JRT_ENTRY(void, SharedRuntime::notify_jvmti_vthread_unmount(oopDesc* vt, jboolean hide, JavaThread* current))
657 jobject vthread = JNIHandles::make_local(const_cast<oopDesc*>(vt));
658 JvmtiVTMSTransitionDisabler::VTMS_vthread_unmount(vthread, hide);
659 JNIHandles::destroy_local(vthread);
660 JRT_END
661 #endif // INCLUDE_JVMTI
662
663 // The interpreter code to call this tracing function is only
664 // called/generated when UL is on for redefine, class and has the right level
665 // and tags. Since obsolete methods are never compiled, we don't have
666 // to modify the compilers to generate calls to this function.
667 //
668 JRT_LEAF(int, SharedRuntime::rc_trace_method_entry(
669 JavaThread* thread, Method* method))
670 if (method->is_obsolete()) {
671 // We are calling an obsolete method, but this is not necessarily
672 // an error. Our method could have been redefined just after we
673 // fetched the Method* from the constant pool.
674 ResourceMark rm;
675 log_trace(redefine, class, obsolete)("calling obsolete method '%s'", method->name_and_sig_as_C_string());
676 }
677 return 0;
678 JRT_END
679
680 // ret_pc points into caller; we are returning caller's exception handler
681 // for given exception
682 // Note that the implementation of this method assumes it's only called when an exception has actually occured
683 address SharedRuntime::compute_compiled_exc_handler(nmethod* nm, address ret_pc, Handle& exception,
684 bool force_unwind, bool top_frame_only, bool& recursive_exception_occurred) {
685 assert(nm != nullptr, "must exist");
686 ResourceMark rm;
687
688 #if INCLUDE_JVMCI
689 if (nm->is_compiled_by_jvmci()) {
690 // lookup exception handler for this pc
691 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
692 ExceptionHandlerTable table(nm);
693 HandlerTableEntry *t = table.entry_for(catch_pco, -1, 0);
694 if (t != nullptr) {
695 return nm->code_begin() + t->pco();
696 } else {
697 return Deoptimization::deoptimize_for_missing_exception_handler(nm);
698 }
699 }
700 #endif // INCLUDE_JVMCI
701
702 ScopeDesc* sd = nm->scope_desc_at(ret_pc);
703 // determine handler bci, if any
704 EXCEPTION_MARK;
705
706 int handler_bci = -1;
707 int scope_depth = 0;
708 if (!force_unwind) {
709 int bci = sd->bci();
710 bool recursive_exception = false;
711 do {
712 bool skip_scope_increment = false;
713 // exception handler lookup
714 Klass* ek = exception->klass();
715 methodHandle mh(THREAD, sd->method());
716 handler_bci = Method::fast_exception_handler_bci_for(mh, ek, bci, THREAD);
717 if (HAS_PENDING_EXCEPTION) {
718 recursive_exception = true;
719 // We threw an exception while trying to find the exception handler.
720 // Transfer the new exception to the exception handle which will
721 // be set into thread local storage, and do another lookup for an
722 // exception handler for this exception, this time starting at the
723 // BCI of the exception handler which caused the exception to be
724 // thrown (bugs 4307310 and 4546590). Set "exception" reference
725 // argument to ensure that the correct exception is thrown (4870175).
726 recursive_exception_occurred = true;
727 exception = Handle(THREAD, PENDING_EXCEPTION);
728 CLEAR_PENDING_EXCEPTION;
729 if (handler_bci >= 0) {
730 bci = handler_bci;
731 handler_bci = -1;
732 skip_scope_increment = true;
733 }
734 }
735 else {
736 recursive_exception = false;
737 }
738 if (!top_frame_only && handler_bci < 0 && !skip_scope_increment) {
739 sd = sd->sender();
740 if (sd != nullptr) {
741 bci = sd->bci();
742 }
743 ++scope_depth;
744 }
745 } while (recursive_exception || (!top_frame_only && handler_bci < 0 && sd != nullptr));
746 }
747
748 // found handling method => lookup exception handler
749 int catch_pco = pointer_delta_as_int(ret_pc, nm->code_begin());
750
751 ExceptionHandlerTable table(nm);
752 HandlerTableEntry *t = table.entry_for(catch_pco, handler_bci, scope_depth);
753 if (t == nullptr && (nm->is_compiled_by_c1() || handler_bci != -1)) {
754 // Allow abbreviated catch tables. The idea is to allow a method
755 // to materialize its exceptions without committing to the exact
756 // routing of exceptions. In particular this is needed for adding
757 // a synthetic handler to unlock monitors when inlining
758 // synchronized methods since the unlock path isn't represented in
759 // the bytecodes.
760 t = table.entry_for(catch_pco, -1, 0);
761 }
762
763 #ifdef COMPILER1
764 if (t == nullptr && nm->is_compiled_by_c1()) {
765 assert(nm->unwind_handler_begin() != nullptr, "");
766 return nm->unwind_handler_begin();
767 }
768 #endif
769
770 if (t == nullptr) {
771 ttyLocker ttyl;
772 tty->print_cr("MISSING EXCEPTION HANDLER for pc " INTPTR_FORMAT " and handler bci %d, catch_pco: %d", p2i(ret_pc), handler_bci, catch_pco);
773 tty->print_cr(" Exception:");
774 exception->print();
775 tty->cr();
776 tty->print_cr(" Compiled exception table :");
777 table.print();
778 nm->print();
779 nm->print_code();
780 guarantee(false, "missing exception handler");
781 return nullptr;
782 }
783
784 if (handler_bci != -1) { // did we find a handler in this method?
785 sd->method()->set_exception_handler_entered(handler_bci); // profile
786 }
787 return nm->code_begin() + t->pco();
788 }
789
790 JRT_ENTRY(void, SharedRuntime::throw_AbstractMethodError(JavaThread* current))
791 // These errors occur only at call sites
792 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_AbstractMethodError());
793 JRT_END
794
795 JRT_ENTRY(void, SharedRuntime::throw_IncompatibleClassChangeError(JavaThread* current))
796 // These errors occur only at call sites
797 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_IncompatibleClassChangeError(), "vtable stub");
798 JRT_END
799
800 JRT_ENTRY(void, SharedRuntime::throw_ArithmeticException(JavaThread* current))
801 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_ArithmeticException(), "/ by zero");
802 JRT_END
803
804 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException(JavaThread* current))
805 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
806 JRT_END
807
808 JRT_ENTRY(void, SharedRuntime::throw_NullPointerException_at_call(JavaThread* current))
809 // This entry point is effectively only used for NullPointerExceptions which occur at inline
810 // cache sites (when the callee activation is not yet set up) so we are at a call site
811 throw_and_post_jvmti_exception(current, vmSymbols::java_lang_NullPointerException(), nullptr);
812 JRT_END
813
814 JRT_ENTRY(void, SharedRuntime::throw_StackOverflowError(JavaThread* current))
815 throw_StackOverflowError_common(current, false);
816 JRT_END
817
818 JRT_ENTRY(void, SharedRuntime::throw_delayed_StackOverflowError(JavaThread* current))
819 throw_StackOverflowError_common(current, true);
820 JRT_END
821
822 void SharedRuntime::throw_StackOverflowError_common(JavaThread* current, bool delayed) {
823 // We avoid using the normal exception construction in this case because
824 // it performs an upcall to Java, and we're already out of stack space.
825 JavaThread* THREAD = current; // For exception macros.
826 Klass* k = vmClasses::StackOverflowError_klass();
827 oop exception_oop = InstanceKlass::cast(k)->allocate_instance(CHECK);
828 if (delayed) {
829 java_lang_Throwable::set_message(exception_oop,
830 Universe::delayed_stack_overflow_error_message());
831 }
832 Handle exception (current, exception_oop);
833 if (StackTraceInThrowable) {
834 java_lang_Throwable::fill_in_stack_trace(exception);
835 }
836 // Remove the ScopedValue bindings in case we got a
837 // StackOverflowError while we were trying to remove ScopedValue
838 // bindings.
839 current->clear_scopedValueBindings();
840 // Increment counter for hs_err file reporting
841 Atomic::inc(&Exceptions::_stack_overflow_errors);
842 throw_and_post_jvmti_exception(current, exception);
843 }
844
845 address SharedRuntime::continuation_for_implicit_exception(JavaThread* current,
846 address pc,
847 ImplicitExceptionKind exception_kind)
848 {
849 address target_pc = nullptr;
850
851 if (Interpreter::contains(pc)) {
852 switch (exception_kind) {
853 case IMPLICIT_NULL: return Interpreter::throw_NullPointerException_entry();
854 case IMPLICIT_DIVIDE_BY_ZERO: return Interpreter::throw_ArithmeticException_entry();
855 case STACK_OVERFLOW: return Interpreter::throw_StackOverflowError_entry();
856 default: ShouldNotReachHere();
857 }
858 } else {
859 switch (exception_kind) {
860 case STACK_OVERFLOW: {
861 // Stack overflow only occurs upon frame setup; the callee is
862 // going to be unwound. Dispatch to a shared runtime stub
863 // which will cause the StackOverflowError to be fabricated
864 // and processed.
865 // Stack overflow should never occur during deoptimization:
866 // the compiled method bangs the stack by as much as the
867 // interpreter would need in case of a deoptimization. The
868 // deoptimization blob and uncommon trap blob bang the stack
869 // in a debug VM to verify the correctness of the compiled
870 // method stack banging.
871 assert(current->deopt_mark() == nullptr, "no stack overflow from deopt blob/uncommon trap");
872 Events::log_exception(current, "StackOverflowError at " INTPTR_FORMAT, p2i(pc));
873 return StubRoutines::throw_StackOverflowError_entry();
874 }
875
876 case IMPLICIT_NULL: {
877 if (VtableStubs::contains(pc)) {
878 // We haven't yet entered the callee frame. Fabricate an
879 // exception and begin dispatching it in the caller. Since
880 // the caller was at a call site, it's safe to destroy all
881 // caller-saved registers, as these entry points do.
882 VtableStub* vt_stub = VtableStubs::stub_containing(pc);
883
884 // If vt_stub is null, then return null to signal handler to report the SEGV error.
885 if (vt_stub == nullptr) return nullptr;
886
887 if (vt_stub->is_abstract_method_error(pc)) {
888 assert(!vt_stub->is_vtable_stub(), "should never see AbstractMethodErrors from vtable-type VtableStubs");
889 Events::log_exception(current, "AbstractMethodError at " INTPTR_FORMAT, p2i(pc));
890 // Instead of throwing the abstract method error here directly, we re-resolve
891 // and will throw the AbstractMethodError during resolve. As a result, we'll
892 // get a more detailed error message.
893 return SharedRuntime::get_handle_wrong_method_stub();
894 } else {
895 Events::log_exception(current, "NullPointerException at vtable entry " INTPTR_FORMAT, p2i(pc));
896 // Assert that the signal comes from the expected location in stub code.
897 assert(vt_stub->is_null_pointer_exception(pc),
898 "obtained signal from unexpected location in stub code");
899 return StubRoutines::throw_NullPointerException_at_call_entry();
900 }
901 } else {
902 CodeBlob* cb = CodeCache::find_blob(pc);
903
904 // If code blob is null, then return null to signal handler to report the SEGV error.
905 if (cb == nullptr) return nullptr;
906
907 // Exception happened in CodeCache. Must be either:
908 // 1. Inline-cache check in C2I handler blob,
909 // 2. Inline-cache check in nmethod, or
910 // 3. Implicit null exception in nmethod
911
912 if (!cb->is_nmethod()) {
913 bool is_in_blob = cb->is_adapter_blob() || cb->is_method_handles_adapter_blob();
914 if (!is_in_blob) {
915 // Allow normal crash reporting to handle this
916 return nullptr;
917 }
918 Events::log_exception(current, "NullPointerException in code blob at " INTPTR_FORMAT, p2i(pc));
919 // There is no handler here, so we will simply unwind.
920 return StubRoutines::throw_NullPointerException_at_call_entry();
921 }
922
923 // Otherwise, it's a compiled method. Consult its exception handlers.
924 nmethod* nm = cb->as_nmethod();
925 if (nm->inlinecache_check_contains(pc)) {
926 // exception happened inside inline-cache check code
927 // => the nmethod is not yet active (i.e., the frame
928 // is not set up yet) => use return address pushed by
929 // caller => don't push another return address
930 Events::log_exception(current, "NullPointerException in IC check " INTPTR_FORMAT, p2i(pc));
931 return StubRoutines::throw_NullPointerException_at_call_entry();
932 }
933
934 if (nm->method()->is_method_handle_intrinsic()) {
935 // exception happened inside MH dispatch code, similar to a vtable stub
936 Events::log_exception(current, "NullPointerException in MH adapter " INTPTR_FORMAT, p2i(pc));
937 return StubRoutines::throw_NullPointerException_at_call_entry();
938 }
939
940 #ifndef PRODUCT
941 _implicit_null_throws++;
942 #endif
943 target_pc = nm->continuation_for_implicit_null_exception(pc);
944 // If there's an unexpected fault, target_pc might be null,
945 // in which case we want to fall through into the normal
946 // error handling code.
947 }
948
949 break; // fall through
950 }
951
952
953 case IMPLICIT_DIVIDE_BY_ZERO: {
954 nmethod* nm = CodeCache::find_nmethod(pc);
955 guarantee(nm != nullptr, "must have containing compiled method for implicit division-by-zero exceptions");
956 #ifndef PRODUCT
957 _implicit_div0_throws++;
958 #endif
959 target_pc = nm->continuation_for_implicit_div0_exception(pc);
960 // If there's an unexpected fault, target_pc might be null,
961 // in which case we want to fall through into the normal
962 // error handling code.
963 break; // fall through
964 }
965
966 default: ShouldNotReachHere();
967 }
968
969 assert(exception_kind == IMPLICIT_NULL || exception_kind == IMPLICIT_DIVIDE_BY_ZERO, "wrong implicit exception kind");
970
971 if (exception_kind == IMPLICIT_NULL) {
972 #ifndef PRODUCT
973 // for AbortVMOnException flag
974 Exceptions::debug_check_abort("java.lang.NullPointerException");
975 #endif //PRODUCT
976 Events::log_exception(current, "Implicit null exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
977 } else {
978 #ifndef PRODUCT
979 // for AbortVMOnException flag
980 Exceptions::debug_check_abort("java.lang.ArithmeticException");
981 #endif //PRODUCT
982 Events::log_exception(current, "Implicit division by zero exception at " INTPTR_FORMAT " to " INTPTR_FORMAT, p2i(pc), p2i(target_pc));
983 }
984 return target_pc;
985 }
986
987 ShouldNotReachHere();
988 return nullptr;
989 }
990
991
992 /**
993 * Throws an java/lang/UnsatisfiedLinkError. The address of this method is
994 * installed in the native function entry of all native Java methods before
995 * they get linked to their actual native methods.
996 *
997 * \note
998 * This method actually never gets called! The reason is because
999 * the interpreter's native entries call NativeLookup::lookup() which
1000 * throws the exception when the lookup fails. The exception is then
1001 * caught and forwarded on the return from NativeLookup::lookup() call
1002 * before the call to the native function. This might change in the future.
1003 */
1004 JNI_ENTRY(void*, throw_unsatisfied_link_error(JNIEnv* env, ...))
1005 {
1006 // We return a bad value here to make sure that the exception is
1007 // forwarded before we look at the return value.
1008 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
1009 }
1010 JNI_END
1011
1012 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
1013 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
1014 }
1015
1016 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
1017 #if INCLUDE_JVMCI
1018 if (!obj->klass()->has_finalizer()) {
1019 return;
1020 }
1021 #endif // INCLUDE_JVMCI
1022 assert(oopDesc::is_oop(obj), "must be a valid oop");
1023 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
1024 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
1025 JRT_END
1026
1027 jlong SharedRuntime::get_java_tid(JavaThread* thread) {
1028 assert(thread != nullptr, "No thread");
1029 if (thread == nullptr) {
1030 return 0;
1031 }
1032 guarantee(Thread::current() != thread || thread->is_oop_safe(),
1033 "current cannot touch oops after its GC barrier is detached.");
1034 oop obj = thread->threadObj();
1035 return (obj == nullptr) ? 0 : java_lang_Thread::thread_id(obj);
1036 }
1037
1038 /**
1039 * This function ought to be a void function, but cannot be because
1040 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1041 * 6254741. Once that is fixed we can remove the dummy return value.
1042 */
1043 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1044 return dtrace_object_alloc(JavaThread::current(), o, o->size());
1045 }
1046
1047 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o) {
1048 return dtrace_object_alloc(thread, o, o->size());
1049 }
1050
1051 int SharedRuntime::dtrace_object_alloc(JavaThread* thread, oopDesc* o, size_t size) {
1052 assert(DTraceAllocProbes, "wrong call");
1053 Klass* klass = o->klass();
1054 Symbol* name = klass->name();
1055 HOTSPOT_OBJECT_ALLOC(
1056 get_java_tid(thread),
1057 (char *) name->bytes(), name->utf8_length(), size * HeapWordSize);
1058 return 0;
1059 }
1060
1061 JRT_LEAF(int, SharedRuntime::dtrace_method_entry(
1062 JavaThread* current, Method* method))
1063 assert(current == JavaThread::current(), "pre-condition");
1064
1065 assert(DTraceMethodProbes, "wrong call");
1066 Symbol* kname = method->klass_name();
1067 Symbol* name = method->name();
1068 Symbol* sig = method->signature();
1069 HOTSPOT_METHOD_ENTRY(
1070 get_java_tid(current),
1071 (char *) kname->bytes(), kname->utf8_length(),
1072 (char *) name->bytes(), name->utf8_length(),
1073 (char *) sig->bytes(), sig->utf8_length());
1074 return 0;
1075 JRT_END
1076
1077 JRT_LEAF(int, SharedRuntime::dtrace_method_exit(
1078 JavaThread* current, Method* method))
1079 assert(current == JavaThread::current(), "pre-condition");
1080 assert(DTraceMethodProbes, "wrong call");
1081 Symbol* kname = method->klass_name();
1082 Symbol* name = method->name();
1083 Symbol* sig = method->signature();
1084 HOTSPOT_METHOD_RETURN(
1085 get_java_tid(current),
1086 (char *) kname->bytes(), kname->utf8_length(),
1087 (char *) name->bytes(), name->utf8_length(),
1088 (char *) sig->bytes(), sig->utf8_length());
1089 return 0;
1090 JRT_END
1091
1092
1093 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode)
1094 // for a call current in progress, i.e., arguments has been pushed on stack
1095 // put callee has not been invoked yet. Used by: resolve virtual/static,
1096 // vtable updates, etc. Caller frame must be compiled.
1097 Handle SharedRuntime::find_callee_info(Bytecodes::Code& bc, CallInfo& callinfo, TRAPS) {
1098 JavaThread* current = THREAD;
1099 ResourceMark rm(current);
1100
1101 // last java frame on stack (which includes native call frames)
1102 vframeStream vfst(current, true); // Do not skip and javaCalls
1103
1104 return find_callee_info_helper(vfst, bc, callinfo, THREAD);
1105 }
1106
1107 Method* SharedRuntime::extract_attached_method(vframeStream& vfst) {
1108 nmethod* caller = vfst.nm();
1109
1110 address pc = vfst.frame_pc();
1111 { // Get call instruction under lock because another thread may be busy patching it.
1112 CompiledICLocker ic_locker(caller);
1113 return caller->attached_method_before_pc(pc);
1114 }
1115 return nullptr;
1116 }
1117
1118 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1119 // for a call current in progress, i.e., arguments has been pushed on stack
1120 // but callee has not been invoked yet. Caller frame must be compiled.
1121 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1122 CallInfo& callinfo, TRAPS) {
1123 Handle receiver;
1124 Handle nullHandle; // create a handy null handle for exception returns
1125 JavaThread* current = THREAD;
1126
1127 assert(!vfst.at_end(), "Java frame must exist");
1128
1129 // Find caller and bci from vframe
1130 methodHandle caller(current, vfst.method());
1131 int bci = vfst.bci();
1132
1133 if (caller->is_continuation_enter_intrinsic()) {
1134 bc = Bytecodes::_invokestatic;
1135 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1136 return receiver;
1137 }
1138
1139 Bytecode_invoke bytecode(caller, bci);
1140 int bytecode_index = bytecode.index();
1141 bc = bytecode.invoke_code();
1142
1143 methodHandle attached_method(current, extract_attached_method(vfst));
1144 if (attached_method.not_null()) {
1145 Method* callee = bytecode.static_target(CHECK_NH);
1146 vmIntrinsics::ID id = callee->intrinsic_id();
1147 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1148 // it attaches statically resolved method to the call site.
1149 if (MethodHandles::is_signature_polymorphic(id) &&
1150 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1151 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1152
1153 // Adjust invocation mode according to the attached method.
1154 switch (bc) {
1155 case Bytecodes::_invokevirtual:
1156 if (attached_method->method_holder()->is_interface()) {
1157 bc = Bytecodes::_invokeinterface;
1158 }
1159 break;
1160 case Bytecodes::_invokeinterface:
1161 if (!attached_method->method_holder()->is_interface()) {
1162 bc = Bytecodes::_invokevirtual;
1163 }
1164 break;
1165 case Bytecodes::_invokehandle:
1166 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1167 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1168 : Bytecodes::_invokevirtual;
1169 }
1170 break;
1171 default:
1172 break;
1173 }
1174 }
1175 }
1176
1177 assert(bc != Bytecodes::_illegal, "not initialized");
1178
1179 bool has_receiver = bc != Bytecodes::_invokestatic &&
1180 bc != Bytecodes::_invokedynamic &&
1181 bc != Bytecodes::_invokehandle;
1182
1183 // Find receiver for non-static call
1184 if (has_receiver) {
1185 // This register map must be update since we need to find the receiver for
1186 // compiled frames. The receiver might be in a register.
1187 RegisterMap reg_map2(current,
1188 RegisterMap::UpdateMap::include,
1189 RegisterMap::ProcessFrames::include,
1190 RegisterMap::WalkContinuation::skip);
1191 frame stubFrame = current->last_frame();
1192 // Caller-frame is a compiled frame
1193 frame callerFrame = stubFrame.sender(®_map2);
1194
1195 if (attached_method.is_null()) {
1196 Method* callee = bytecode.static_target(CHECK_NH);
1197 if (callee == nullptr) {
1198 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1199 }
1200 }
1201
1202 // Retrieve from a compiled argument list
1203 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1204 assert(oopDesc::is_oop_or_null(receiver()), "");
1205
1206 if (receiver.is_null()) {
1207 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1208 }
1209 }
1210
1211 // Resolve method
1212 if (attached_method.not_null()) {
1213 // Parameterized by attached method.
1214 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1215 } else {
1216 // Parameterized by bytecode.
1217 constantPoolHandle constants(current, caller->constants());
1218 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1219 }
1220
1221 #ifdef ASSERT
1222 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1223 if (has_receiver) {
1224 assert(receiver.not_null(), "should have thrown exception");
1225 Klass* receiver_klass = receiver->klass();
1226 Klass* rk = nullptr;
1227 if (attached_method.not_null()) {
1228 // In case there's resolved method attached, use its holder during the check.
1229 rk = attached_method->method_holder();
1230 } else {
1231 // Klass is already loaded.
1232 constantPoolHandle constants(current, caller->constants());
1233 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1234 }
1235 Klass* static_receiver_klass = rk;
1236 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1237 "actual receiver must be subclass of static receiver klass");
1238 if (receiver_klass->is_instance_klass()) {
1239 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1240 tty->print_cr("ERROR: Klass not yet initialized!!");
1241 receiver_klass->print();
1242 }
1243 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1244 }
1245 }
1246 #endif
1247
1248 return receiver;
1249 }
1250
1251 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1252 JavaThread* current = THREAD;
1253 ResourceMark rm(current);
1254 // We need first to check if any Java activations (compiled, interpreted)
1255 // exist on the stack since last JavaCall. If not, we need
1256 // to get the target method from the JavaCall wrapper.
1257 vframeStream vfst(current, true); // Do not skip any javaCalls
1258 methodHandle callee_method;
1259 if (vfst.at_end()) {
1260 // No Java frames were found on stack since we did the JavaCall.
1261 // Hence the stack can only contain an entry_frame. We need to
1262 // find the target method from the stub frame.
1263 RegisterMap reg_map(current,
1264 RegisterMap::UpdateMap::skip,
1265 RegisterMap::ProcessFrames::include,
1266 RegisterMap::WalkContinuation::skip);
1267 frame fr = current->last_frame();
1268 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1269 fr = fr.sender(®_map);
1270 assert(fr.is_entry_frame(), "must be");
1271 // fr is now pointing to the entry frame.
1272 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1273 } else {
1274 Bytecodes::Code bc;
1275 CallInfo callinfo;
1276 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1277 callee_method = methodHandle(current, callinfo.selected_method());
1278 }
1279 assert(callee_method()->is_method(), "must be");
1280 return callee_method;
1281 }
1282
1283 // Resolves a call.
1284 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1285 JavaThread* current = THREAD;
1286 ResourceMark rm(current);
1287 RegisterMap cbl_map(current,
1288 RegisterMap::UpdateMap::skip,
1289 RegisterMap::ProcessFrames::include,
1290 RegisterMap::WalkContinuation::skip);
1291 frame caller_frame = current->last_frame().sender(&cbl_map);
1292
1293 CodeBlob* caller_cb = caller_frame.cb();
1294 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1295 nmethod* caller_nm = caller_cb->as_nmethod();
1296
1297 // determine call info & receiver
1298 // note: a) receiver is null for static calls
1299 // b) an exception is thrown if receiver is null for non-static calls
1300 CallInfo call_info;
1301 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1302 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1303
1304 NoSafepointVerifier nsv;
1305
1306 methodHandle callee_method(current, call_info.selected_method());
1307
1308 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1309 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1310 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1311 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1312 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1313
1314 assert(!caller_nm->is_unloading(), "It should not be unloading");
1315
1316 #ifndef PRODUCT
1317 // tracing/debugging/statistics
1318 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1319 (is_virtual) ? (&_resolve_virtual_ctr) :
1320 (&_resolve_static_ctr);
1321 Atomic::inc(addr);
1322
1323 if (TraceCallFixup) {
1324 ResourceMark rm(current);
1325 tty->print("resolving %s%s (%s) call to",
1326 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1327 Bytecodes::name(invoke_code));
1328 callee_method->print_short_name(tty);
1329 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1330 p2i(caller_frame.pc()), p2i(callee_method->code()));
1331 }
1332 #endif
1333
1334 if (invoke_code == Bytecodes::_invokestatic) {
1335 assert(callee_method->method_holder()->is_initialized() ||
1336 callee_method->method_holder()->is_init_thread(current),
1337 "invalid class initialization state for invoke_static");
1338 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1339 // In order to keep class initialization check, do not patch call
1340 // site for static call when the class is not fully initialized.
1341 // Proper check is enforced by call site re-resolution on every invocation.
1342 //
1343 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1344 // explicit class initialization check is put in nmethod entry (VEP).
1345 assert(callee_method->method_holder()->is_linked(), "must be");
1346 return callee_method;
1347 }
1348 }
1349
1350
1351 // JSR 292 key invariant:
1352 // If the resolved method is a MethodHandle invoke target, the call
1353 // site must be a MethodHandle call site, because the lambda form might tail-call
1354 // leaving the stack in a state unknown to either caller or callee
1355
1356 // Compute entry points. The computation of the entry points is independent of
1357 // patching the call.
1358
1359 // Make sure the callee nmethod does not get deoptimized and removed before
1360 // we are done patching the code.
1361
1362
1363 CompiledICLocker ml(caller_nm);
1364 if (is_virtual && !is_optimized) {
1365 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1366 inline_cache->update(&call_info, receiver->klass());
1367 } else {
1368 // Callsite is a direct call - set it to the destination method
1369 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1370 callsite->set(callee_method);
1371 }
1372
1373 return callee_method;
1374 }
1375
1376 // Inline caches exist only in compiled code
1377 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1378 #ifdef ASSERT
1379 RegisterMap reg_map(current,
1380 RegisterMap::UpdateMap::skip,
1381 RegisterMap::ProcessFrames::include,
1382 RegisterMap::WalkContinuation::skip);
1383 frame stub_frame = current->last_frame();
1384 assert(stub_frame.is_runtime_frame(), "sanity check");
1385 frame caller_frame = stub_frame.sender(®_map);
1386 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1387 #endif /* ASSERT */
1388
1389 methodHandle callee_method;
1390 JRT_BLOCK
1391 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1392 // Return Method* through TLS
1393 current->set_vm_result_2(callee_method());
1394 JRT_BLOCK_END
1395 // return compiled code entry point after potential safepoints
1396 return get_resolved_entry(current, callee_method);
1397 JRT_END
1398
1399
1400 // Handle call site that has been made non-entrant
1401 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1402 // 6243940 We might end up in here if the callee is deoptimized
1403 // as we race to call it. We don't want to take a safepoint if
1404 // the caller was interpreted because the caller frame will look
1405 // interpreted to the stack walkers and arguments are now
1406 // "compiled" so it is much better to make this transition
1407 // invisible to the stack walking code. The i2c path will
1408 // place the callee method in the callee_target. It is stashed
1409 // there because if we try and find the callee by normal means a
1410 // safepoint is possible and have trouble gc'ing the compiled args.
1411 RegisterMap reg_map(current,
1412 RegisterMap::UpdateMap::skip,
1413 RegisterMap::ProcessFrames::include,
1414 RegisterMap::WalkContinuation::skip);
1415 frame stub_frame = current->last_frame();
1416 assert(stub_frame.is_runtime_frame(), "sanity check");
1417 frame caller_frame = stub_frame.sender(®_map);
1418
1419 if (caller_frame.is_interpreted_frame() ||
1420 caller_frame.is_entry_frame() ||
1421 caller_frame.is_upcall_stub_frame()) {
1422 Method* callee = current->callee_target();
1423 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1424 current->set_vm_result_2(callee);
1425 current->set_callee_target(nullptr);
1426 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1427 // Bypass class initialization checks in c2i when caller is in native.
1428 // JNI calls to static methods don't have class initialization checks.
1429 // Fast class initialization checks are present in c2i adapters and call into
1430 // SharedRuntime::handle_wrong_method() on the slow path.
1431 //
1432 // JVM upcalls may land here as well, but there's a proper check present in
1433 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1434 // so bypassing it in c2i adapter is benign.
1435 return callee->get_c2i_no_clinit_check_entry();
1436 } else {
1437 return callee->get_c2i_entry();
1438 }
1439 }
1440
1441 // Must be compiled to compiled path which is safe to stackwalk
1442 methodHandle callee_method;
1443 JRT_BLOCK
1444 // Force resolving of caller (if we called from compiled frame)
1445 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1446 current->set_vm_result_2(callee_method());
1447 JRT_BLOCK_END
1448 // return compiled code entry point after potential safepoints
1449 return get_resolved_entry(current, callee_method);
1450 JRT_END
1451
1452 // Handle abstract method call
1453 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1454 // Verbose error message for AbstractMethodError.
1455 // Get the called method from the invoke bytecode.
1456 vframeStream vfst(current, true);
1457 assert(!vfst.at_end(), "Java frame must exist");
1458 methodHandle caller(current, vfst.method());
1459 Bytecode_invoke invoke(caller, vfst.bci());
1460 DEBUG_ONLY( invoke.verify(); )
1461
1462 // Find the compiled caller frame.
1463 RegisterMap reg_map(current,
1464 RegisterMap::UpdateMap::include,
1465 RegisterMap::ProcessFrames::include,
1466 RegisterMap::WalkContinuation::skip);
1467 frame stubFrame = current->last_frame();
1468 assert(stubFrame.is_runtime_frame(), "must be");
1469 frame callerFrame = stubFrame.sender(®_map);
1470 assert(callerFrame.is_compiled_frame(), "must be");
1471
1472 // Install exception and return forward entry.
1473 address res = StubRoutines::throw_AbstractMethodError_entry();
1474 JRT_BLOCK
1475 methodHandle callee(current, invoke.static_target(current));
1476 if (!callee.is_null()) {
1477 oop recv = callerFrame.retrieve_receiver(®_map);
1478 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1479 res = StubRoutines::forward_exception_entry();
1480 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1481 }
1482 JRT_BLOCK_END
1483 return res;
1484 JRT_END
1485
1486 // return verified_code_entry if interp_only_mode is not set for the current thread;
1487 // otherwise return c2i entry.
1488 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1489 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1490 // In interp_only_mode we need to go to the interpreted entry
1491 // The c2i won't patch in this mode -- see fixup_callers_callsite
1492 return callee_method->get_c2i_entry();
1493 }
1494 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1495 return callee_method->verified_code_entry();
1496 }
1497
1498 // resolve a static call and patch code
1499 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1500 methodHandle callee_method;
1501 bool enter_special = false;
1502 JRT_BLOCK
1503 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1504 current->set_vm_result_2(callee_method());
1505 JRT_BLOCK_END
1506 // return compiled code entry point after potential safepoints
1507 return get_resolved_entry(current, callee_method);
1508 JRT_END
1509
1510 // resolve virtual call and update inline cache to monomorphic
1511 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1512 methodHandle callee_method;
1513 JRT_BLOCK
1514 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1515 current->set_vm_result_2(callee_method());
1516 JRT_BLOCK_END
1517 // return compiled code entry point after potential safepoints
1518 return get_resolved_entry(current, callee_method);
1519 JRT_END
1520
1521
1522 // Resolve a virtual call that can be statically bound (e.g., always
1523 // monomorphic, so it has no inline cache). Patch code to resolved target.
1524 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1525 methodHandle callee_method;
1526 JRT_BLOCK
1527 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1528 current->set_vm_result_2(callee_method());
1529 JRT_BLOCK_END
1530 // return compiled code entry point after potential safepoints
1531 return get_resolved_entry(current, callee_method);
1532 JRT_END
1533
1534 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1535 JavaThread* current = THREAD;
1536 ResourceMark rm(current);
1537 CallInfo call_info;
1538 Bytecodes::Code bc;
1539
1540 // receiver is null for static calls. An exception is thrown for null
1541 // receivers for non-static calls
1542 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1543
1544 methodHandle callee_method(current, call_info.selected_method());
1545
1546 #ifndef PRODUCT
1547 Atomic::inc(&_ic_miss_ctr);
1548
1549 // Statistics & Tracing
1550 if (TraceCallFixup) {
1551 ResourceMark rm(current);
1552 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1553 callee_method->print_short_name(tty);
1554 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1555 }
1556
1557 if (ICMissHistogram) {
1558 MutexLocker m(VMStatistic_lock);
1559 RegisterMap reg_map(current,
1560 RegisterMap::UpdateMap::skip,
1561 RegisterMap::ProcessFrames::include,
1562 RegisterMap::WalkContinuation::skip);
1563 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1564 // produce statistics under the lock
1565 trace_ic_miss(f.pc());
1566 }
1567 #endif
1568
1569 // install an event collector so that when a vtable stub is created the
1570 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1571 // event can't be posted when the stub is created as locks are held
1572 // - instead the event will be deferred until the event collector goes
1573 // out of scope.
1574 JvmtiDynamicCodeEventCollector event_collector;
1575
1576 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1577 RegisterMap reg_map(current,
1578 RegisterMap::UpdateMap::skip,
1579 RegisterMap::ProcessFrames::include,
1580 RegisterMap::WalkContinuation::skip);
1581 frame caller_frame = current->last_frame().sender(®_map);
1582 CodeBlob* cb = caller_frame.cb();
1583 nmethod* caller_nm = cb->as_nmethod();
1584
1585 CompiledICLocker ml(caller_nm);
1586 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1587 inline_cache->update(&call_info, receiver()->klass());
1588
1589 return callee_method;
1590 }
1591
1592 //
1593 // Resets a call-site in compiled code so it will get resolved again.
1594 // This routines handles both virtual call sites, optimized virtual call
1595 // sites, and static call sites. Typically used to change a call sites
1596 // destination from compiled to interpreted.
1597 //
1598 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1599 JavaThread* current = THREAD;
1600 ResourceMark rm(current);
1601 RegisterMap reg_map(current,
1602 RegisterMap::UpdateMap::skip,
1603 RegisterMap::ProcessFrames::include,
1604 RegisterMap::WalkContinuation::skip);
1605 frame stub_frame = current->last_frame();
1606 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1607 frame caller = stub_frame.sender(®_map);
1608
1609 // Do nothing if the frame isn't a live compiled frame.
1610 // nmethod could be deoptimized by the time we get here
1611 // so no update to the caller is needed.
1612
1613 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1614 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1615
1616 address pc = caller.pc();
1617
1618 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1619 assert(caller_nm != nullptr, "did not find caller nmethod");
1620
1621 // Default call_addr is the location of the "basic" call.
1622 // Determine the address of the call we a reresolving. With
1623 // Inline Caches we will always find a recognizable call.
1624 // With Inline Caches disabled we may or may not find a
1625 // recognizable call. We will always find a call for static
1626 // calls and for optimized virtual calls. For vanilla virtual
1627 // calls it depends on the state of the UseInlineCaches switch.
1628 //
1629 // With Inline Caches disabled we can get here for a virtual call
1630 // for two reasons:
1631 // 1 - calling an abstract method. The vtable for abstract methods
1632 // will run us thru handle_wrong_method and we will eventually
1633 // end up in the interpreter to throw the ame.
1634 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1635 // call and between the time we fetch the entry address and
1636 // we jump to it the target gets deoptimized. Similar to 1
1637 // we will wind up in the interprter (thru a c2i with c2).
1638 //
1639 CompiledICLocker ml(caller_nm);
1640 address call_addr = caller_nm->call_instruction_address(pc);
1641
1642 if (call_addr != nullptr) {
1643 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1644 // bytes back in the instruction stream so we must also check for reloc info.
1645 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1646 bool ret = iter.next(); // Get item
1647 if (ret) {
1648 switch (iter.type()) {
1649 case relocInfo::static_call_type:
1650 case relocInfo::opt_virtual_call_type: {
1651 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1652 cdc->set_to_clean();
1653 break;
1654 }
1655
1656 case relocInfo::virtual_call_type: {
1657 // compiled, dispatched call (which used to call an interpreted method)
1658 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1659 inline_cache->set_to_clean();
1660 break;
1661 }
1662 default:
1663 break;
1664 }
1665 }
1666 }
1667 }
1668
1669 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1670
1671
1672 #ifndef PRODUCT
1673 Atomic::inc(&_wrong_method_ctr);
1674
1675 if (TraceCallFixup) {
1676 ResourceMark rm(current);
1677 tty->print("handle_wrong_method reresolving call to");
1678 callee_method->print_short_name(tty);
1679 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1680 }
1681 #endif
1682
1683 return callee_method;
1684 }
1685
1686 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1687 // The faulting unsafe accesses should be changed to throw the error
1688 // synchronously instead. Meanwhile the faulting instruction will be
1689 // skipped over (effectively turning it into a no-op) and an
1690 // asynchronous exception will be raised which the thread will
1691 // handle at a later point. If the instruction is a load it will
1692 // return garbage.
1693
1694 // Request an async exception.
1695 thread->set_pending_unsafe_access_error();
1696
1697 // Return address of next instruction to execute.
1698 return next_pc;
1699 }
1700
1701 #ifdef ASSERT
1702 void SharedRuntime::check_member_name_argument_is_last_argument(const methodHandle& method,
1703 const BasicType* sig_bt,
1704 const VMRegPair* regs) {
1705 ResourceMark rm;
1706 const int total_args_passed = method->size_of_parameters();
1707 const VMRegPair* regs_with_member_name = regs;
1708 VMRegPair* regs_without_member_name = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed - 1);
1709
1710 const int member_arg_pos = total_args_passed - 1;
1711 assert(member_arg_pos >= 0 && member_arg_pos < total_args_passed, "oob");
1712 assert(sig_bt[member_arg_pos] == T_OBJECT, "dispatch argument must be an object");
1713
1714 java_calling_convention(sig_bt, regs_without_member_name, total_args_passed - 1);
1715
1716 for (int i = 0; i < member_arg_pos; i++) {
1717 VMReg a = regs_with_member_name[i].first();
1718 VMReg b = regs_without_member_name[i].first();
1719 assert(a->value() == b->value(), "register allocation mismatch: a= %d, b= %d", a->value(), b->value());
1720 }
1721 assert(regs_with_member_name[member_arg_pos].first()->is_valid(), "bad member arg");
1722 }
1723 #endif
1724
1725 // ---------------------------------------------------------------------------
1726 // We are calling the interpreter via a c2i. Normally this would mean that
1727 // we were called by a compiled method. However we could have lost a race
1728 // where we went int -> i2c -> c2i and so the caller could in fact be
1729 // interpreted. If the caller is compiled we attempt to patch the caller
1730 // so he no longer calls into the interpreter.
1731 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1732 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1733
1734 // It's possible that deoptimization can occur at a call site which hasn't
1735 // been resolved yet, in which case this function will be called from
1736 // an nmethod that has been patched for deopt and we can ignore the
1737 // request for a fixup.
1738 // Also it is possible that we lost a race in that from_compiled_entry
1739 // is now back to the i2c in that case we don't need to patch and if
1740 // we did we'd leap into space because the callsite needs to use
1741 // "to interpreter" stub in order to load up the Method*. Don't
1742 // ask me how I know this...
1743
1744 // Result from nmethod::is_unloading is not stable across safepoints.
1745 NoSafepointVerifier nsv;
1746
1747 nmethod* callee = method->code();
1748 if (callee == nullptr) {
1749 return;
1750 }
1751
1752 // write lock needed because we might patch call site by set_to_clean()
1753 // and is_unloading() can modify nmethod's state
1754 MACOS_AARCH64_ONLY(ThreadWXEnable __wx(WXWrite, JavaThread::current()));
1755
1756 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1757 if (cb == nullptr || !cb->is_nmethod() || !callee->is_in_use() || callee->is_unloading()) {
1758 return;
1759 }
1760
1761 // The check above makes sure this is an nmethod.
1762 nmethod* caller = cb->as_nmethod();
1763
1764 // Get the return PC for the passed caller PC.
1765 address return_pc = caller_pc + frame::pc_return_offset;
1766
1767 if (!caller->is_in_use() || !NativeCall::is_call_before(return_pc)) {
1768 return;
1769 }
1770
1771 // Expect to find a native call there (unless it was no-inline cache vtable dispatch)
1772 CompiledICLocker ic_locker(caller);
1773 ResourceMark rm;
1774
1775 // If we got here through a static call or opt_virtual call, then we know where the
1776 // call address would be; let's peek at it
1777 address callsite_addr = (address)nativeCall_before(return_pc);
1778 RelocIterator iter(caller, callsite_addr, callsite_addr + 1);
1779 if (!iter.next()) {
1780 // No reloc entry found; not a static or optimized virtual call
1781 return;
1782 }
1783
1784 relocInfo::relocType type = iter.reloc()->type();
1785 if (type != relocInfo::static_call_type &&
1786 type != relocInfo::opt_virtual_call_type) {
1787 return;
1788 }
1789
1790 CompiledDirectCall* callsite = CompiledDirectCall::before(return_pc);
1791 callsite->set_to_clean();
1792 JRT_END
1793
1794
1795 // same as JVM_Arraycopy, but called directly from compiled code
1796 JRT_ENTRY(void, SharedRuntime::slow_arraycopy_C(oopDesc* src, jint src_pos,
1797 oopDesc* dest, jint dest_pos,
1798 jint length,
1799 JavaThread* current)) {
1800 #ifndef PRODUCT
1801 _slow_array_copy_ctr++;
1802 #endif
1803 // Check if we have null pointers
1804 if (src == nullptr || dest == nullptr) {
1805 THROW(vmSymbols::java_lang_NullPointerException());
1806 }
1807 // Do the copy. The casts to arrayOop are necessary to the copy_array API,
1808 // even though the copy_array API also performs dynamic checks to ensure
1809 // that src and dest are truly arrays (and are conformable).
1810 // The copy_array mechanism is awkward and could be removed, but
1811 // the compilers don't call this function except as a last resort,
1812 // so it probably doesn't matter.
1813 src->klass()->copy_array((arrayOopDesc*)src, src_pos,
1814 (arrayOopDesc*)dest, dest_pos,
1815 length, current);
1816 }
1817 JRT_END
1818
1819 // The caller of generate_class_cast_message() (or one of its callers)
1820 // must use a ResourceMark in order to correctly free the result.
1821 char* SharedRuntime::generate_class_cast_message(
1822 JavaThread* thread, Klass* caster_klass) {
1823
1824 // Get target class name from the checkcast instruction
1825 vframeStream vfst(thread, true);
1826 assert(!vfst.at_end(), "Java frame must exist");
1827 Bytecode_checkcast cc(vfst.method(), vfst.method()->bcp_from(vfst.bci()));
1828 constantPoolHandle cpool(thread, vfst.method()->constants());
1829 Klass* target_klass = ConstantPool::klass_at_if_loaded(cpool, cc.index());
1830 Symbol* target_klass_name = nullptr;
1831 if (target_klass == nullptr) {
1832 // This klass should be resolved, but just in case, get the name in the klass slot.
1833 target_klass_name = cpool->klass_name_at(cc.index());
1834 }
1835 return generate_class_cast_message(caster_klass, target_klass, target_klass_name);
1836 }
1837
1838
1839 // The caller of generate_class_cast_message() (or one of its callers)
1840 // must use a ResourceMark in order to correctly free the result.
1841 char* SharedRuntime::generate_class_cast_message(
1842 Klass* caster_klass, Klass* target_klass, Symbol* target_klass_name) {
1843 const char* caster_name = caster_klass->external_name();
1844
1845 assert(target_klass != nullptr || target_klass_name != nullptr, "one must be provided");
1846 const char* target_name = target_klass == nullptr ? target_klass_name->as_klass_external_name() :
1847 target_klass->external_name();
1848
1849 size_t msglen = strlen(caster_name) + strlen("class ") + strlen(" cannot be cast to class ") + strlen(target_name) + 1;
1850
1851 const char* caster_klass_description = "";
1852 const char* target_klass_description = "";
1853 const char* klass_separator = "";
1854 if (target_klass != nullptr && caster_klass->module() == target_klass->module()) {
1855 caster_klass_description = caster_klass->joint_in_module_of_loader(target_klass);
1856 } else {
1857 caster_klass_description = caster_klass->class_in_module_of_loader();
1858 target_klass_description = (target_klass != nullptr) ? target_klass->class_in_module_of_loader() : "";
1859 klass_separator = (target_klass != nullptr) ? "; " : "";
1860 }
1861
1862 // add 3 for parenthesis and preceding space
1863 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1864
1865 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1866 if (message == nullptr) {
1867 // Shouldn't happen, but don't cause even more problems if it does
1868 message = const_cast<char*>(caster_klass->external_name());
1869 } else {
1870 jio_snprintf(message,
1871 msglen,
1872 "class %s cannot be cast to class %s (%s%s%s)",
1873 caster_name,
1874 target_name,
1875 caster_klass_description,
1876 klass_separator,
1877 target_klass_description
1878 );
1879 }
1880 return message;
1881 }
1882
1883 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1884 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
1885 JRT_END
1886
1887 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1888 if (!SafepointSynchronize::is_synchronizing()) {
1889 // Only try quick_enter() if we're not trying to reach a safepoint
1890 // so that the calling thread reaches the safepoint more quickly.
1891 if (ObjectSynchronizer::quick_enter(obj, current, lock)) {
1892 return;
1893 }
1894 }
1895 // NO_ASYNC required because an async exception on the state transition destructor
1896 // would leave you with the lock held and it would never be released.
1897 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1898 // and the model is that an exception implies the method failed.
1899 JRT_BLOCK_NO_ASYNC
1900 Handle h_obj(THREAD, obj);
1901 ObjectSynchronizer::enter(h_obj, lock, current);
1902 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
1903 JRT_BLOCK_END
1904 }
1905
1906 // Handles the uncommon case in locking, i.e., contention or an inflated lock.
1907 JRT_BLOCK_ENTRY(void, SharedRuntime::complete_monitor_locking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1908 SharedRuntime::monitor_enter_helper(obj, lock, current);
1909 JRT_END
1910
1911 void SharedRuntime::monitor_exit_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1912 assert(JavaThread::current() == current, "invariant");
1913 // Exit must be non-blocking, and therefore no exceptions can be thrown.
1914 ExceptionMark em(current);
1915 // The object could become unlocked through a JNI call, which we have no other checks for.
1916 // Give a fatal message if CheckJNICalls. Otherwise we ignore it.
1917 if (obj->is_unlocked()) {
1918 if (CheckJNICalls) {
1919 fatal("Object has been unlocked by JNI");
1920 }
1921 return;
1922 }
1923 ObjectSynchronizer::exit(obj, lock, current);
1924 }
1925
1926 // Handles the uncommon cases of monitor unlocking in compiled code
1927 JRT_LEAF(void, SharedRuntime::complete_monitor_unlocking_C(oopDesc* obj, BasicLock* lock, JavaThread* current))
1928 assert(current == JavaThread::current(), "pre-condition");
1929 SharedRuntime::monitor_exit_helper(obj, lock, current);
1930 JRT_END
1931
1932 // This is only called when CheckJNICalls is true, and only
1933 // for virtual thread termination.
1934 JRT_LEAF(void, SharedRuntime::log_jni_monitor_still_held())
1935 assert(CheckJNICalls, "Only call this when checking JNI usage");
1936 if (log_is_enabled(Debug, jni)) {
1937 JavaThread* current = JavaThread::current();
1938 int64_t vthread_id = java_lang_Thread::thread_id(current->vthread());
1939 int64_t carrier_id = java_lang_Thread::thread_id(current->threadObj());
1940 log_debug(jni)("VirtualThread (tid: " INT64_FORMAT ", carrier id: " INT64_FORMAT
1941 ") exiting with Objects still locked by JNI MonitorEnter.",
1942 vthread_id, carrier_id);
1943 }
1944 JRT_END
1945
1946 #ifndef PRODUCT
1947
1948 void SharedRuntime::print_statistics() {
1949 ttyLocker ttyl;
1950 if (xtty != nullptr) xtty->head("statistics type='SharedRuntime'");
1951
1952 SharedRuntime::print_ic_miss_histogram();
1953
1954 // Dump the JRT_ENTRY counters
1955 if (_new_instance_ctr) tty->print_cr("%5u new instance requires GC", _new_instance_ctr);
1956 if (_new_array_ctr) tty->print_cr("%5u new array requires GC", _new_array_ctr);
1957 if (_multi2_ctr) tty->print_cr("%5u multianewarray 2 dim", _multi2_ctr);
1958 if (_multi3_ctr) tty->print_cr("%5u multianewarray 3 dim", _multi3_ctr);
1959 if (_multi4_ctr) tty->print_cr("%5u multianewarray 4 dim", _multi4_ctr);
1960 if (_multi5_ctr) tty->print_cr("%5u multianewarray 5 dim", _multi5_ctr);
1961
1962 tty->print_cr("%5u inline cache miss in compiled", _ic_miss_ctr);
1963 tty->print_cr("%5u wrong method", _wrong_method_ctr);
1964 tty->print_cr("%5u unresolved static call site", _resolve_static_ctr);
1965 tty->print_cr("%5u unresolved virtual call site", _resolve_virtual_ctr);
1966 tty->print_cr("%5u unresolved opt virtual call site", _resolve_opt_virtual_ctr);
1967
1968 if (_mon_enter_stub_ctr) tty->print_cr("%5u monitor enter stub", _mon_enter_stub_ctr);
1969 if (_mon_exit_stub_ctr) tty->print_cr("%5u monitor exit stub", _mon_exit_stub_ctr);
1970 if (_mon_enter_ctr) tty->print_cr("%5u monitor enter slow", _mon_enter_ctr);
1971 if (_mon_exit_ctr) tty->print_cr("%5u monitor exit slow", _mon_exit_ctr);
1972 if (_partial_subtype_ctr) tty->print_cr("%5u slow partial subtype", _partial_subtype_ctr);
1973 if (_jbyte_array_copy_ctr) tty->print_cr("%5u byte array copies", _jbyte_array_copy_ctr);
1974 if (_jshort_array_copy_ctr) tty->print_cr("%5u short array copies", _jshort_array_copy_ctr);
1975 if (_jint_array_copy_ctr) tty->print_cr("%5u int array copies", _jint_array_copy_ctr);
1976 if (_jlong_array_copy_ctr) tty->print_cr("%5u long array copies", _jlong_array_copy_ctr);
1977 if (_oop_array_copy_ctr) tty->print_cr("%5u oop array copies", _oop_array_copy_ctr);
1978 if (_checkcast_array_copy_ctr) tty->print_cr("%5u checkcast array copies", _checkcast_array_copy_ctr);
1979 if (_unsafe_array_copy_ctr) tty->print_cr("%5u unsafe array copies", _unsafe_array_copy_ctr);
1980 if (_generic_array_copy_ctr) tty->print_cr("%5u generic array copies", _generic_array_copy_ctr);
1981 if (_slow_array_copy_ctr) tty->print_cr("%5u slow array copies", _slow_array_copy_ctr);
1982 if (_find_handler_ctr) tty->print_cr("%5u find exception handler", _find_handler_ctr);
1983 if (_rethrow_ctr) tty->print_cr("%5u rethrow handler", _rethrow_ctr);
1984 if (_unsafe_set_memory_ctr) tty->print_cr("%5u unsafe set memorys", _unsafe_set_memory_ctr);
1985
1986 AdapterHandlerLibrary::print_statistics();
1987
1988 if (xtty != nullptr) xtty->tail("statistics");
1989 }
1990
1991 inline double percent(int64_t x, int64_t y) {
1992 return 100.0 * (double)x / (double)MAX2(y, (int64_t)1);
1993 }
1994
1995 class MethodArityHistogram {
1996 public:
1997 enum { MAX_ARITY = 256 };
1998 private:
1999 static uint64_t _arity_histogram[MAX_ARITY]; // histogram of #args
2000 static uint64_t _size_histogram[MAX_ARITY]; // histogram of arg size in words
2001 static uint64_t _total_compiled_calls;
2002 static uint64_t _max_compiled_calls_per_method;
2003 static int _max_arity; // max. arity seen
2004 static int _max_size; // max. arg size seen
2005
2006 static void add_method_to_histogram(nmethod* nm) {
2007 Method* method = (nm == nullptr) ? nullptr : nm->method();
2008 if (method != nullptr) {
2009 ArgumentCount args(method->signature());
2010 int arity = args.size() + (method->is_static() ? 0 : 1);
2011 int argsize = method->size_of_parameters();
2012 arity = MIN2(arity, MAX_ARITY-1);
2013 argsize = MIN2(argsize, MAX_ARITY-1);
2014 uint64_t count = (uint64_t)method->compiled_invocation_count();
2015 _max_compiled_calls_per_method = count > _max_compiled_calls_per_method ? count : _max_compiled_calls_per_method;
2016 _total_compiled_calls += count;
2017 _arity_histogram[arity] += count;
2018 _size_histogram[argsize] += count;
2019 _max_arity = MAX2(_max_arity, arity);
2020 _max_size = MAX2(_max_size, argsize);
2021 }
2022 }
2023
2024 void print_histogram_helper(int n, uint64_t* histo, const char* name) {
2025 const int N = MIN2(9, n);
2026 double sum = 0;
2027 double weighted_sum = 0;
2028 for (int i = 0; i <= n; i++) { sum += (double)histo[i]; weighted_sum += (double)(i*histo[i]); }
2029 if (sum >= 1) { // prevent divide by zero or divide overflow
2030 double rest = sum;
2031 double percent = sum / 100;
2032 for (int i = 0; i <= N; i++) {
2033 rest -= (double)histo[i];
2034 tty->print_cr("%4d: " UINT64_FORMAT_W(12) " (%5.1f%%)", i, histo[i], (double)histo[i] / percent);
2035 }
2036 tty->print_cr("rest: " INT64_FORMAT_W(12) " (%5.1f%%)", (int64_t)rest, rest / percent);
2037 tty->print_cr("(avg. %s = %3.1f, max = %d)", name, weighted_sum / sum, n);
2038 tty->print_cr("(total # of compiled calls = " INT64_FORMAT_W(14) ")", _total_compiled_calls);
2039 tty->print_cr("(max # of compiled calls = " INT64_FORMAT_W(14) ")", _max_compiled_calls_per_method);
2040 } else {
2041 tty->print_cr("Histogram generation failed for %s. n = %d, sum = %7.5f", name, n, sum);
2042 }
2043 }
2044
2045 void print_histogram() {
2046 tty->print_cr("\nHistogram of call arity (incl. rcvr, calls to compiled methods only):");
2047 print_histogram_helper(_max_arity, _arity_histogram, "arity");
2048 tty->print_cr("\nHistogram of parameter block size (in words, incl. rcvr):");
2049 print_histogram_helper(_max_size, _size_histogram, "size");
2050 tty->cr();
2051 }
2052
2053 public:
2054 MethodArityHistogram() {
2055 // Take the Compile_lock to protect against changes in the CodeBlob structures
2056 MutexLocker mu1(Compile_lock, Mutex::_safepoint_check_flag);
2057 // Take the CodeCache_lock to protect against changes in the CodeHeap structure
2058 MutexLocker mu2(CodeCache_lock, Mutex::_no_safepoint_check_flag);
2059 _max_arity = _max_size = 0;
2060 _total_compiled_calls = 0;
2061 _max_compiled_calls_per_method = 0;
2062 for (int i = 0; i < MAX_ARITY; i++) _arity_histogram[i] = _size_histogram[i] = 0;
2063 CodeCache::nmethods_do(add_method_to_histogram);
2064 print_histogram();
2065 }
2066 };
2067
2068 uint64_t MethodArityHistogram::_arity_histogram[MethodArityHistogram::MAX_ARITY];
2069 uint64_t MethodArityHistogram::_size_histogram[MethodArityHistogram::MAX_ARITY];
2070 uint64_t MethodArityHistogram::_total_compiled_calls;
2071 uint64_t MethodArityHistogram::_max_compiled_calls_per_method;
2072 int MethodArityHistogram::_max_arity;
2073 int MethodArityHistogram::_max_size;
2074
2075 void SharedRuntime::print_call_statistics(uint64_t comp_total) {
2076 tty->print_cr("Calls from compiled code:");
2077 int64_t total = _nof_normal_calls + _nof_interface_calls + _nof_static_calls;
2078 int64_t mono_c = _nof_normal_calls - _nof_megamorphic_calls;
2079 int64_t mono_i = _nof_interface_calls;
2080 tty->print_cr("\t" INT64_FORMAT_W(12) " (100%%) total non-inlined ", total);
2081 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- virtual calls ", _nof_normal_calls, percent(_nof_normal_calls, total));
2082 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_calls, percent(_nof_inlined_calls, _nof_normal_calls));
2083 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_c, percent(mono_c, _nof_normal_calls));
2084 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- megamorphic ", _nof_megamorphic_calls, percent(_nof_megamorphic_calls, _nof_normal_calls));
2085 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- interface calls ", _nof_interface_calls, percent(_nof_interface_calls, total));
2086 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_interface_calls, percent(_nof_inlined_interface_calls, _nof_interface_calls));
2087 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- monomorphic ", mono_i, percent(mono_i, _nof_interface_calls));
2088 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.1f%%) |- static/special calls", _nof_static_calls, percent(_nof_static_calls, total));
2089 tty->print_cr("\t" INT64_FORMAT_W(12) " (%4.0f%%) | |- inlined ", _nof_inlined_static_calls, percent(_nof_inlined_static_calls, _nof_static_calls));
2090 tty->cr();
2091 tty->print_cr("Note 1: counter updates are not MT-safe.");
2092 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2093 tty->print_cr(" %% in nested categories are relative to their category");
2094 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2095 tty->cr();
2096
2097 MethodArityHistogram h;
2098 }
2099 #endif
2100
2101 #ifndef PRODUCT
2102 static int _lookups; // number of calls to lookup
2103 static int _equals; // number of buckets checked with matching hash
2104 static int _hits; // number of successful lookups
2105 static int _compact; // number of equals calls with compact signature
2106 #endif
2107
2108 // A simple wrapper class around the calling convention information
2109 // that allows sharing of adapters for the same calling convention.
2110 class AdapterFingerPrint : public CHeapObj<mtCode> {
2111 private:
2112 enum {
2113 _basic_type_bits = 4,
2114 _basic_type_mask = right_n_bits(_basic_type_bits),
2115 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2116 _compact_int_count = 3
2117 };
2118 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2119 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2120
2121 union {
2122 int _compact[_compact_int_count];
2123 int* _fingerprint;
2124 } _value;
2125 int _length; // A negative length indicates the fingerprint is in the compact form,
2126 // Otherwise _value._fingerprint is the array.
2127
2128 // Remap BasicTypes that are handled equivalently by the adapters.
2129 // These are correct for the current system but someday it might be
2130 // necessary to make this mapping platform dependent.
2131 static int adapter_encoding(BasicType in) {
2132 switch (in) {
2133 case T_BOOLEAN:
2134 case T_BYTE:
2135 case T_SHORT:
2136 case T_CHAR:
2137 // There are all promoted to T_INT in the calling convention
2138 return T_INT;
2139
2140 case T_OBJECT:
2141 case T_ARRAY:
2142 // In other words, we assume that any register good enough for
2143 // an int or long is good enough for a managed pointer.
2144 #ifdef _LP64
2145 return T_LONG;
2146 #else
2147 return T_INT;
2148 #endif
2149
2150 case T_INT:
2151 case T_LONG:
2152 case T_FLOAT:
2153 case T_DOUBLE:
2154 case T_VOID:
2155 return in;
2156
2157 default:
2158 ShouldNotReachHere();
2159 return T_CONFLICT;
2160 }
2161 }
2162
2163 public:
2164 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2165 // The fingerprint is based on the BasicType signature encoded
2166 // into an array of ints with eight entries per int.
2167 int* ptr;
2168 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2169 if (len <= _compact_int_count) {
2170 assert(_compact_int_count == 3, "else change next line");
2171 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2172 // Storing the signature encoded as signed chars hits about 98%
2173 // of the time.
2174 _length = -len;
2175 ptr = _value._compact;
2176 } else {
2177 _length = len;
2178 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2179 ptr = _value._fingerprint;
2180 }
2181
2182 // Now pack the BasicTypes with 8 per int
2183 int sig_index = 0;
2184 for (int index = 0; index < len; index++) {
2185 int value = 0;
2186 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2187 int bt = adapter_encoding(sig_bt[sig_index++]);
2188 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2189 value = (value << _basic_type_bits) | bt;
2190 }
2191 ptr[index] = value;
2192 }
2193 }
2194
2195 ~AdapterFingerPrint() {
2196 if (_length > 0) {
2197 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2198 }
2199 }
2200
2201 int value(int index) {
2202 if (_length < 0) {
2203 return _value._compact[index];
2204 }
2205 return _value._fingerprint[index];
2206 }
2207 int length() {
2208 if (_length < 0) return -_length;
2209 return _length;
2210 }
2211
2212 bool is_compact() {
2213 return _length <= 0;
2214 }
2215
2216 unsigned int compute_hash() {
2217 int hash = 0;
2218 for (int i = 0; i < length(); i++) {
2219 int v = value(i);
2220 hash = (hash << 8) ^ v ^ (hash >> 5);
2221 }
2222 return (unsigned int)hash;
2223 }
2224
2225 const char* as_string() {
2226 stringStream st;
2227 st.print("0x");
2228 for (int i = 0; i < length(); i++) {
2229 st.print("%x", value(i));
2230 }
2231 return st.as_string();
2232 }
2233
2234 #ifndef PRODUCT
2235 // Reconstitutes the basic type arguments from the fingerprint,
2236 // producing strings like LIJDF
2237 const char* as_basic_args_string() {
2238 stringStream st;
2239 bool long_prev = false;
2240 for (int i = 0; i < length(); i++) {
2241 unsigned val = (unsigned)value(i);
2242 // args are packed so that first/lower arguments are in the highest
2243 // bits of each int value, so iterate from highest to the lowest
2244 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2245 unsigned v = (val >> j) & _basic_type_mask;
2246 if (v == 0) {
2247 assert(i == length() - 1, "Only expect zeroes in the last word");
2248 continue;
2249 }
2250 if (long_prev) {
2251 long_prev = false;
2252 if (v == T_VOID) {
2253 st.print("J");
2254 } else {
2255 st.print("L");
2256 }
2257 }
2258 switch (v) {
2259 case T_INT: st.print("I"); break;
2260 case T_LONG: long_prev = true; break;
2261 case T_FLOAT: st.print("F"); break;
2262 case T_DOUBLE: st.print("D"); break;
2263 case T_VOID: break;
2264 default: ShouldNotReachHere();
2265 }
2266 }
2267 }
2268 if (long_prev) {
2269 st.print("L");
2270 }
2271 return st.as_string();
2272 }
2273 #endif // !product
2274
2275 bool equals(AdapterFingerPrint* other) {
2276 if (other->_length != _length) {
2277 return false;
2278 }
2279 if (_length < 0) {
2280 assert(_compact_int_count == 3, "else change next line");
2281 return _value._compact[0] == other->_value._compact[0] &&
2282 _value._compact[1] == other->_value._compact[1] &&
2283 _value._compact[2] == other->_value._compact[2];
2284 } else {
2285 for (int i = 0; i < _length; i++) {
2286 if (_value._fingerprint[i] != other->_value._fingerprint[i]) {
2287 return false;
2288 }
2289 }
2290 }
2291 return true;
2292 }
2293
2294 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2295 NOT_PRODUCT(_equals++);
2296 return fp1->equals(fp2);
2297 }
2298
2299 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2300 return fp->compute_hash();
2301 }
2302 };
2303
2304 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2305 using AdapterHandlerTable = ResourceHashtable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2306 AnyObj::C_HEAP, mtCode,
2307 AdapterFingerPrint::compute_hash,
2308 AdapterFingerPrint::equals>;
2309 static AdapterHandlerTable* _adapter_handler_table;
2310
2311 // Find a entry with the same fingerprint if it exists
2312 static AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2313 NOT_PRODUCT(_lookups++);
2314 assert_lock_strong(AdapterHandlerLibrary_lock);
2315 AdapterFingerPrint fp(total_args_passed, sig_bt);
2316 AdapterHandlerEntry** entry = _adapter_handler_table->get(&fp);
2317 if (entry != nullptr) {
2318 #ifndef PRODUCT
2319 if (fp.is_compact()) _compact++;
2320 _hits++;
2321 #endif
2322 return *entry;
2323 }
2324 return nullptr;
2325 }
2326
2327 #ifndef PRODUCT
2328 static void print_table_statistics() {
2329 auto size = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2330 return sizeof(*key) + sizeof(*a);
2331 };
2332 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2333 ts.print(tty, "AdapterHandlerTable");
2334 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2335 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2336 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d compact %d",
2337 _lookups, _equals, _hits, _compact);
2338 }
2339 #endif
2340
2341 // ---------------------------------------------------------------------------
2342 // Implementation of AdapterHandlerLibrary
2343 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = nullptr;
2344 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2345 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2346 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2347 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2348 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2349 const int AdapterHandlerLibrary_size = 16*K;
2350 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2351
2352 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2353 return _buffer;
2354 }
2355
2356 static void post_adapter_creation(const AdapterBlob* new_adapter,
2357 const AdapterHandlerEntry* entry) {
2358 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2359 char blob_id[256];
2360 jio_snprintf(blob_id,
2361 sizeof(blob_id),
2362 "%s(%s)",
2363 new_adapter->name(),
2364 entry->fingerprint()->as_string());
2365 if (Forte::is_enabled()) {
2366 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2367 }
2368
2369 if (JvmtiExport::should_post_dynamic_code_generated()) {
2370 JvmtiExport::post_dynamic_code_generated(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2371 }
2372 }
2373 }
2374
2375 void AdapterHandlerLibrary::initialize() {
2376 ResourceMark rm;
2377 AdapterBlob* no_arg_blob = nullptr;
2378 AdapterBlob* int_arg_blob = nullptr;
2379 AdapterBlob* obj_arg_blob = nullptr;
2380 AdapterBlob* obj_int_arg_blob = nullptr;
2381 AdapterBlob* obj_obj_arg_blob = nullptr;
2382 {
2383 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2384 MutexLocker mu(AdapterHandlerLibrary_lock);
2385
2386 // Create a special handler for abstract methods. Abstract methods
2387 // are never compiled so an i2c entry is somewhat meaningless, but
2388 // throw AbstractMethodError just in case.
2389 // Pass wrong_method_abstract for the c2i transitions to return
2390 // AbstractMethodError for invalid invocations.
2391 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2392 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, nullptr),
2393 StubRoutines::throw_AbstractMethodError_entry(),
2394 wrong_method_abstract, wrong_method_abstract);
2395
2396 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2397 _no_arg_handler = create_adapter(no_arg_blob, 0, nullptr, true);
2398
2399 BasicType obj_args[] = { T_OBJECT };
2400 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args, true);
2401
2402 BasicType int_args[] = { T_INT };
2403 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args, true);
2404
2405 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2406 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args, true);
2407
2408 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2409 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args, true);
2410
2411 assert(no_arg_blob != nullptr &&
2412 obj_arg_blob != nullptr &&
2413 int_arg_blob != nullptr &&
2414 obj_int_arg_blob != nullptr &&
2415 obj_obj_arg_blob != nullptr, "Initial adapters must be properly created");
2416 }
2417
2418 // Outside of the lock
2419 post_adapter_creation(no_arg_blob, _no_arg_handler);
2420 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2421 post_adapter_creation(int_arg_blob, _int_arg_handler);
2422 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2423 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2424 }
2425
2426 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2427 address i2c_entry,
2428 address c2i_entry,
2429 address c2i_unverified_entry,
2430 address c2i_no_clinit_check_entry) {
2431 // Insert an entry into the table
2432 return new AdapterHandlerEntry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry,
2433 c2i_no_clinit_check_entry);
2434 }
2435
2436 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2437 if (method->is_abstract()) {
2438 return _abstract_method_handler;
2439 }
2440 int total_args_passed = method->size_of_parameters(); // All args on stack
2441 if (total_args_passed == 0) {
2442 return _no_arg_handler;
2443 } else if (total_args_passed == 1) {
2444 if (!method->is_static()) {
2445 return _obj_arg_handler;
2446 }
2447 switch (method->signature()->char_at(1)) {
2448 case JVM_SIGNATURE_CLASS:
2449 case JVM_SIGNATURE_ARRAY:
2450 return _obj_arg_handler;
2451 case JVM_SIGNATURE_INT:
2452 case JVM_SIGNATURE_BOOLEAN:
2453 case JVM_SIGNATURE_CHAR:
2454 case JVM_SIGNATURE_BYTE:
2455 case JVM_SIGNATURE_SHORT:
2456 return _int_arg_handler;
2457 }
2458 } else if (total_args_passed == 2 &&
2459 !method->is_static()) {
2460 switch (method->signature()->char_at(1)) {
2461 case JVM_SIGNATURE_CLASS:
2462 case JVM_SIGNATURE_ARRAY:
2463 return _obj_obj_arg_handler;
2464 case JVM_SIGNATURE_INT:
2465 case JVM_SIGNATURE_BOOLEAN:
2466 case JVM_SIGNATURE_CHAR:
2467 case JVM_SIGNATURE_BYTE:
2468 case JVM_SIGNATURE_SHORT:
2469 return _obj_int_arg_handler;
2470 }
2471 }
2472 return nullptr;
2473 }
2474
2475 class AdapterSignatureIterator : public SignatureIterator {
2476 private:
2477 BasicType stack_sig_bt[16];
2478 BasicType* sig_bt;
2479 int index;
2480
2481 public:
2482 AdapterSignatureIterator(Symbol* signature,
2483 fingerprint_t fingerprint,
2484 bool is_static,
2485 int total_args_passed) :
2486 SignatureIterator(signature, fingerprint),
2487 index(0)
2488 {
2489 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2490 if (!is_static) { // Pass in receiver first
2491 sig_bt[index++] = T_OBJECT;
2492 }
2493 do_parameters_on(this);
2494 }
2495
2496 BasicType* basic_types() {
2497 return sig_bt;
2498 }
2499
2500 #ifdef ASSERT
2501 int slots() {
2502 return index;
2503 }
2504 #endif
2505
2506 private:
2507
2508 friend class SignatureIterator; // so do_parameters_on can call do_type
2509 void do_type(BasicType type) {
2510 sig_bt[index++] = type;
2511 if (type == T_LONG || type == T_DOUBLE) {
2512 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2513 }
2514 }
2515 };
2516
2517 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2518 // Use customized signature handler. Need to lock around updates to
2519 // the _adapter_handler_table (it is not safe for concurrent readers
2520 // and a single writer: this could be fixed if it becomes a
2521 // problem).
2522
2523 // Fast-path for trivial adapters
2524 AdapterHandlerEntry* entry = get_simple_adapter(method);
2525 if (entry != nullptr) {
2526 return entry;
2527 }
2528
2529 ResourceMark rm;
2530 AdapterBlob* new_adapter = nullptr;
2531
2532 // Fill in the signature array, for the calling-convention call.
2533 int total_args_passed = method->size_of_parameters(); // All args on stack
2534
2535 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2536 method->is_static(), total_args_passed);
2537 assert(si.slots() == total_args_passed, "");
2538 BasicType* sig_bt = si.basic_types();
2539 {
2540 MutexLocker mu(AdapterHandlerLibrary_lock);
2541
2542 // Lookup method signature's fingerprint
2543 entry = lookup(total_args_passed, sig_bt);
2544
2545 if (entry != nullptr) {
2546 #ifdef ASSERT
2547 if (VerifyAdapterSharing) {
2548 AdapterBlob* comparison_blob = nullptr;
2549 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, false);
2550 assert(comparison_blob == nullptr, "no blob should be created when creating an adapter for comparison");
2551 assert(comparison_entry->compare_code(entry), "code must match");
2552 // Release the one just created and return the original
2553 delete comparison_entry;
2554 }
2555 #endif
2556 return entry;
2557 }
2558
2559 entry = create_adapter(new_adapter, total_args_passed, sig_bt, /* allocate_code_blob */ true);
2560 }
2561
2562 // Outside of the lock
2563 if (new_adapter != nullptr) {
2564 post_adapter_creation(new_adapter, entry);
2565 }
2566 return entry;
2567 }
2568
2569 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& new_adapter,
2570 int total_args_passed,
2571 BasicType* sig_bt,
2572 bool allocate_code_blob) {
2573
2574 // StubRoutines::_final_stubs_code is initialized after this function can be called. As a result,
2575 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated prior
2576 // to all StubRoutines::_final_stubs_code being set. Checks refer to runtime range checks generated
2577 // in an I2C stub that ensure that an I2C stub is called from an interpreter frame or stubs.
2578 bool contains_all_checks = StubRoutines::final_stubs_code() != nullptr;
2579
2580 VMRegPair stack_regs[16];
2581 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2582
2583 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2584 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2585 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2586 CodeBuffer buffer(buf);
2587 short buffer_locs[20];
2588 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2589 sizeof(buffer_locs)/sizeof(relocInfo));
2590
2591 // Make a C heap allocated version of the fingerprint to store in the adapter
2592 AdapterFingerPrint* fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2593 MacroAssembler _masm(&buffer);
2594 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2595 total_args_passed,
2596 comp_args_on_stack,
2597 sig_bt,
2598 regs,
2599 fingerprint);
2600
2601 #ifdef ASSERT
2602 if (VerifyAdapterSharing) {
2603 entry->save_code(buf->code_begin(), buffer.insts_size());
2604 if (!allocate_code_blob) {
2605 return entry;
2606 }
2607 }
2608 #endif
2609
2610 new_adapter = AdapterBlob::create(&buffer);
2611 NOT_PRODUCT(int insts_size = buffer.insts_size());
2612 if (new_adapter == nullptr) {
2613 // CodeCache is full, disable compilation
2614 // Ought to log this but compile log is only per compile thread
2615 // and we're some non descript Java thread.
2616 return nullptr;
2617 }
2618 entry->relocate(new_adapter->content_begin());
2619 #ifndef PRODUCT
2620 // debugging support
2621 if (PrintAdapterHandlers || PrintStubCode) {
2622 ttyLocker ttyl;
2623 entry->print_adapter_on(tty);
2624 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2625 _adapter_handler_table->number_of_entries(), fingerprint->as_basic_args_string(),
2626 fingerprint->as_string(), insts_size);
2627 tty->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(entry->get_c2i_entry()));
2628 if (Verbose || PrintStubCode) {
2629 address first_pc = entry->base_address();
2630 if (first_pc != nullptr) {
2631 Disassembler::decode(first_pc, first_pc + insts_size, tty
2632 NOT_PRODUCT(COMMA &new_adapter->asm_remarks()));
2633 tty->cr();
2634 }
2635 }
2636 }
2637 #endif
2638
2639 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2640 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2641 if (contains_all_checks || !VerifyAdapterCalls) {
2642 assert_lock_strong(AdapterHandlerLibrary_lock);
2643 _adapter_handler_table->put(fingerprint, entry);
2644 }
2645 return entry;
2646 }
2647
2648 address AdapterHandlerEntry::base_address() {
2649 address base = _i2c_entry;
2650 if (base == nullptr) base = _c2i_entry;
2651 assert(base <= _c2i_entry || _c2i_entry == nullptr, "");
2652 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == nullptr, "");
2653 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == nullptr, "");
2654 return base;
2655 }
2656
2657 void AdapterHandlerEntry::relocate(address new_base) {
2658 address old_base = base_address();
2659 assert(old_base != nullptr, "");
2660 ptrdiff_t delta = new_base - old_base;
2661 if (_i2c_entry != nullptr)
2662 _i2c_entry += delta;
2663 if (_c2i_entry != nullptr)
2664 _c2i_entry += delta;
2665 if (_c2i_unverified_entry != nullptr)
2666 _c2i_unverified_entry += delta;
2667 if (_c2i_no_clinit_check_entry != nullptr)
2668 _c2i_no_clinit_check_entry += delta;
2669 assert(base_address() == new_base, "");
2670 }
2671
2672
2673 AdapterHandlerEntry::~AdapterHandlerEntry() {
2674 delete _fingerprint;
2675 #ifdef ASSERT
2676 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2677 #endif
2678 }
2679
2680
2681 #ifdef ASSERT
2682 // Capture the code before relocation so that it can be compared
2683 // against other versions. If the code is captured after relocation
2684 // then relative instructions won't be equivalent.
2685 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2686 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2687 _saved_code_length = length;
2688 memcpy(_saved_code, buffer, length);
2689 }
2690
2691
2692 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
2693 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
2694
2695 if (other->_saved_code_length != _saved_code_length) {
2696 return false;
2697 }
2698
2699 return memcmp(other->_saved_code, _saved_code, _saved_code_length) == 0;
2700 }
2701 #endif
2702
2703
2704 /**
2705 * Create a native wrapper for this native method. The wrapper converts the
2706 * Java-compiled calling convention to the native convention, handles
2707 * arguments, and transitions to native. On return from the native we transition
2708 * back to java blocking if a safepoint is in progress.
2709 */
2710 void AdapterHandlerLibrary::create_native_wrapper(const methodHandle& method) {
2711 ResourceMark rm;
2712 nmethod* nm = nullptr;
2713
2714 // Check if memory should be freed before allocation
2715 CodeCache::gc_on_allocation();
2716
2717 assert(method->is_native(), "must be native");
2718 assert(method->is_special_native_intrinsic() ||
2719 method->has_native_function(), "must have something valid to call!");
2720
2721 {
2722 // Perform the work while holding the lock, but perform any printing outside the lock
2723 MutexLocker mu(AdapterHandlerLibrary_lock);
2724 // See if somebody beat us to it
2725 if (method->code() != nullptr) {
2726 return;
2727 }
2728
2729 const int compile_id = CompileBroker::assign_compile_id(method, CompileBroker::standard_entry_bci);
2730 assert(compile_id > 0, "Must generate native wrapper");
2731
2732
2733 ResourceMark rm;
2734 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2735 if (buf != nullptr) {
2736 CodeBuffer buffer(buf);
2737
2738 if (method->is_continuation_enter_intrinsic()) {
2739 buffer.initialize_stubs_size(192);
2740 }
2741
2742 struct { double data[20]; } locs_buf;
2743 struct { double data[20]; } stubs_locs_buf;
2744 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
2745 #if defined(AARCH64) || defined(PPC64)
2746 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
2747 // in the constant pool to ensure ordering between the barrier and oops
2748 // accesses. For native_wrappers we need a constant.
2749 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
2750 // static java call that is resolved in the runtime.
2751 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
2752 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
2753 }
2754 #endif
2755 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
2756 MacroAssembler _masm(&buffer);
2757
2758 // Fill in the signature array, for the calling-convention call.
2759 const int total_args_passed = method->size_of_parameters();
2760
2761 VMRegPair stack_regs[16];
2762 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2763
2764 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2765 method->is_static(), total_args_passed);
2766 BasicType* sig_bt = si.basic_types();
2767 assert(si.slots() == total_args_passed, "");
2768 BasicType ret_type = si.return_type();
2769
2770 // Now get the compiled-Java arguments layout.
2771 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2772
2773 // Generate the compiled-to-native wrapper code
2774 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
2775
2776 if (nm != nullptr) {
2777 {
2778 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
2779 if (nm->make_in_use()) {
2780 method->set_code(method, nm);
2781 }
2782 }
2783
2784 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
2785 if (directive->PrintAssemblyOption) {
2786 nm->print_code();
2787 }
2788 DirectivesStack::release(directive);
2789 }
2790 }
2791 } // Unlock AdapterHandlerLibrary_lock
2792
2793
2794 // Install the generated code.
2795 if (nm != nullptr) {
2796 const char *msg = method->is_static() ? "(static)" : "";
2797 CompileTask::print_ul(nm, msg);
2798 if (PrintCompilation) {
2799 ttyLocker ttyl;
2800 CompileTask::print(tty, nm, msg);
2801 }
2802 nm->post_compiled_method_load_event();
2803 }
2804 }
2805
2806 // -------------------------------------------------------------------------
2807 // Java-Java calling convention
2808 // (what you use when Java calls Java)
2809
2810 //------------------------------name_for_receiver----------------------------------
2811 // For a given signature, return the VMReg for parameter 0.
2812 VMReg SharedRuntime::name_for_receiver() {
2813 VMRegPair regs;
2814 BasicType sig_bt = T_OBJECT;
2815 (void) java_calling_convention(&sig_bt, ®s, 1);
2816 // Return argument 0 register. In the LP64 build pointers
2817 // take 2 registers, but the VM wants only the 'main' name.
2818 return regs.first();
2819 }
2820
2821 VMRegPair *SharedRuntime::find_callee_arguments(Symbol* sig, bool has_receiver, bool has_appendix, int* arg_size) {
2822 // This method is returning a data structure allocating as a
2823 // ResourceObject, so do not put any ResourceMarks in here.
2824
2825 BasicType *sig_bt = NEW_RESOURCE_ARRAY(BasicType, 256);
2826 VMRegPair *regs = NEW_RESOURCE_ARRAY(VMRegPair, 256);
2827 int cnt = 0;
2828 if (has_receiver) {
2829 sig_bt[cnt++] = T_OBJECT; // Receiver is argument 0; not in signature
2830 }
2831
2832 for (SignatureStream ss(sig); !ss.at_return_type(); ss.next()) {
2833 BasicType type = ss.type();
2834 sig_bt[cnt++] = type;
2835 if (is_double_word_type(type))
2836 sig_bt[cnt++] = T_VOID;
2837 }
2838
2839 if (has_appendix) {
2840 sig_bt[cnt++] = T_OBJECT;
2841 }
2842
2843 assert(cnt < 256, "grow table size");
2844
2845 int comp_args_on_stack;
2846 comp_args_on_stack = java_calling_convention(sig_bt, regs, cnt);
2847
2848 // the calling convention doesn't count out_preserve_stack_slots so
2849 // we must add that in to get "true" stack offsets.
2850
2851 if (comp_args_on_stack) {
2852 for (int i = 0; i < cnt; i++) {
2853 VMReg reg1 = regs[i].first();
2854 if (reg1->is_stack()) {
2855 // Yuck
2856 reg1 = reg1->bias(out_preserve_stack_slots());
2857 }
2858 VMReg reg2 = regs[i].second();
2859 if (reg2->is_stack()) {
2860 // Yuck
2861 reg2 = reg2->bias(out_preserve_stack_slots());
2862 }
2863 regs[i].set_pair(reg2, reg1);
2864 }
2865 }
2866
2867 // results
2868 *arg_size = cnt;
2869 return regs;
2870 }
2871
2872 // OSR Migration Code
2873 //
2874 // This code is used convert interpreter frames into compiled frames. It is
2875 // called from very start of a compiled OSR nmethod. A temp array is
2876 // allocated to hold the interesting bits of the interpreter frame. All
2877 // active locks are inflated to allow them to move. The displaced headers and
2878 // active interpreter locals are copied into the temp buffer. Then we return
2879 // back to the compiled code. The compiled code then pops the current
2880 // interpreter frame off the stack and pushes a new compiled frame. Then it
2881 // copies the interpreter locals and displaced headers where it wants.
2882 // Finally it calls back to free the temp buffer.
2883 //
2884 // All of this is done NOT at any Safepoint, nor is any safepoint or GC allowed.
2885
2886 JRT_LEAF(intptr_t*, SharedRuntime::OSR_migration_begin( JavaThread *current) )
2887 assert(current == JavaThread::current(), "pre-condition");
2888
2889 // During OSR migration, we unwind the interpreted frame and replace it with a compiled
2890 // frame. The stack watermark code below ensures that the interpreted frame is processed
2891 // before it gets unwound. This is helpful as the size of the compiled frame could be
2892 // larger than the interpreted frame, which could result in the new frame not being
2893 // processed correctly.
2894 StackWatermarkSet::before_unwind(current);
2895
2896 //
2897 // This code is dependent on the memory layout of the interpreter local
2898 // array and the monitors. On all of our platforms the layout is identical
2899 // so this code is shared. If some platform lays the their arrays out
2900 // differently then this code could move to platform specific code or
2901 // the code here could be modified to copy items one at a time using
2902 // frame accessor methods and be platform independent.
2903
2904 frame fr = current->last_frame();
2905 assert(fr.is_interpreted_frame(), "");
2906 assert(fr.interpreter_frame_expression_stack_size()==0, "only handle empty stacks");
2907
2908 // Figure out how many monitors are active.
2909 int active_monitor_count = 0;
2910 for (BasicObjectLock *kptr = fr.interpreter_frame_monitor_end();
2911 kptr < fr.interpreter_frame_monitor_begin();
2912 kptr = fr.next_monitor_in_interpreter_frame(kptr) ) {
2913 if (kptr->obj() != nullptr) active_monitor_count++;
2914 }
2915
2916 // QQQ we could place number of active monitors in the array so that compiled code
2917 // could double check it.
2918
2919 Method* moop = fr.interpreter_frame_method();
2920 int max_locals = moop->max_locals();
2921 // Allocate temp buffer, 1 word per local & 2 per active monitor
2922 int buf_size_words = max_locals + active_monitor_count * BasicObjectLock::size();
2923 intptr_t *buf = NEW_C_HEAP_ARRAY(intptr_t,buf_size_words, mtCode);
2924
2925 // Copy the locals. Order is preserved so that loading of longs works.
2926 // Since there's no GC I can copy the oops blindly.
2927 assert(sizeof(HeapWord)==sizeof(intptr_t), "fix this code");
2928 Copy::disjoint_words((HeapWord*)fr.interpreter_frame_local_at(max_locals-1),
2929 (HeapWord*)&buf[0],
2930 max_locals);
2931
2932 // Inflate locks. Copy the displaced headers. Be careful, there can be holes.
2933 int i = max_locals;
2934 for (BasicObjectLock *kptr2 = fr.interpreter_frame_monitor_end();
2935 kptr2 < fr.interpreter_frame_monitor_begin();
2936 kptr2 = fr.next_monitor_in_interpreter_frame(kptr2) ) {
2937 if (kptr2->obj() != nullptr) { // Avoid 'holes' in the monitor array
2938 BasicLock *lock = kptr2->lock();
2939 if (LockingMode == LM_LEGACY) {
2940 // Inflate so the object's header no longer refers to the BasicLock.
2941 if (lock->displaced_header().is_unlocked()) {
2942 // The object is locked and the resulting ObjectMonitor* will also be
2943 // locked so it can't be async deflated until ownership is dropped.
2944 // See the big comment in basicLock.cpp: BasicLock::move_to().
2945 ObjectSynchronizer::inflate_helper(kptr2->obj());
2946 }
2947 // Now the displaced header is free to move because the
2948 // object's header no longer refers to it.
2949 buf[i] = (intptr_t)lock->displaced_header().value();
2950 }
2951 #ifdef ASSERT
2952 else {
2953 buf[i] = badDispHeaderOSR;
2954 }
2955 #endif
2956 i++;
2957 buf[i++] = cast_from_oop<intptr_t>(kptr2->obj());
2958 }
2959 }
2960 assert(i - max_locals == active_monitor_count*2, "found the expected number of monitors");
2961
2962 RegisterMap map(current,
2963 RegisterMap::UpdateMap::skip,
2964 RegisterMap::ProcessFrames::include,
2965 RegisterMap::WalkContinuation::skip);
2966 frame sender = fr.sender(&map);
2967 if (sender.is_interpreted_frame()) {
2968 current->push_cont_fastpath(sender.sp());
2969 }
2970
2971 return buf;
2972 JRT_END
2973
2974 JRT_LEAF(void, SharedRuntime::OSR_migration_end( intptr_t* buf) )
2975 FREE_C_HEAP_ARRAY(intptr_t, buf);
2976 JRT_END
2977
2978 bool AdapterHandlerLibrary::contains(const CodeBlob* b) {
2979 bool found = false;
2980 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2981 return (found = (b == CodeCache::find_blob(a->get_i2c_entry())));
2982 };
2983 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
2984 _adapter_handler_table->iterate(findblob);
2985 return found;
2986 }
2987
2988 void AdapterHandlerLibrary::print_handler_on(outputStream* st, const CodeBlob* b) {
2989 bool found = false;
2990 auto findblob = [&] (AdapterFingerPrint* key, AdapterHandlerEntry* a) {
2991 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
2992 found = true;
2993 st->print("Adapter for signature: ");
2994 a->print_adapter_on(st);
2995 return true;
2996 } else {
2997 return false; // keep looking
2998 }
2999 };
3000 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3001 _adapter_handler_table->iterate(findblob);
3002 assert(found, "Should have found handler");
3003 }
3004
3005 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3006 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3007 if (get_i2c_entry() != nullptr) {
3008 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3009 }
3010 if (get_c2i_entry() != nullptr) {
3011 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3012 }
3013 if (get_c2i_unverified_entry() != nullptr) {
3014 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3015 }
3016 if (get_c2i_no_clinit_check_entry() != nullptr) {
3017 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3018 }
3019 st->cr();
3020 }
3021
3022 #ifndef PRODUCT
3023
3024 void AdapterHandlerLibrary::print_statistics() {
3025 print_table_statistics();
3026 }
3027
3028 #endif /* PRODUCT */
3029
3030 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3031 assert(current == JavaThread::current(), "pre-condition");
3032 StackOverflow* overflow_state = current->stack_overflow_state();
3033 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3034 overflow_state->set_reserved_stack_activation(current->stack_base());
3035 JRT_END
3036
3037 frame SharedRuntime::look_for_reserved_stack_annotated_method(JavaThread* current, frame fr) {
3038 ResourceMark rm(current);
3039 frame activation;
3040 nmethod* nm = nullptr;
3041 int count = 1;
3042
3043 assert(fr.is_java_frame(), "Must start on Java frame");
3044
3045 RegisterMap map(JavaThread::current(),
3046 RegisterMap::UpdateMap::skip,
3047 RegisterMap::ProcessFrames::skip,
3048 RegisterMap::WalkContinuation::skip); // don't walk continuations
3049 for (; !fr.is_first_frame(); fr = fr.sender(&map)) {
3050 if (!fr.is_java_frame()) {
3051 continue;
3052 }
3053
3054 Method* method = nullptr;
3055 bool found = false;
3056 if (fr.is_interpreted_frame()) {
3057 method = fr.interpreter_frame_method();
3058 if (method != nullptr && method->has_reserved_stack_access()) {
3059 found = true;
3060 }
3061 } else {
3062 CodeBlob* cb = fr.cb();
3063 if (cb != nullptr && cb->is_nmethod()) {
3064 nm = cb->as_nmethod();
3065 method = nm->method();
3066 // scope_desc_near() must be used, instead of scope_desc_at() because on
3067 // SPARC, the pcDesc can be on the delay slot after the call instruction.
3068 for (ScopeDesc *sd = nm->scope_desc_near(fr.pc()); sd != nullptr; sd = sd->sender()) {
3069 method = sd->method();
3070 if (method != nullptr && method->has_reserved_stack_access()) {
3071 found = true;
3072 }
3073 }
3074 }
3075 }
3076 if (found) {
3077 activation = fr;
3078 warning("Potentially dangerous stack overflow in "
3079 "ReservedStackAccess annotated method %s [%d]",
3080 method->name_and_sig_as_C_string(), count++);
3081 EventReservedStackActivation event;
3082 if (event.should_commit()) {
3083 event.set_method(method);
3084 event.commit();
3085 }
3086 }
3087 }
3088 return activation;
3089 }
3090
3091 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3092 // After any safepoint, just before going back to compiled code,
3093 // we inform the GC that we will be doing initializing writes to
3094 // this object in the future without emitting card-marks, so
3095 // GC may take any compensating steps.
3096
3097 oop new_obj = current->vm_result();
3098 if (new_obj == nullptr) return;
3099
3100 BarrierSet *bs = BarrierSet::barrier_set();
3101 bs->on_slowpath_allocation_exit(current, new_obj);
3102 }